Import invoice data excel quickbooksεργασίες

Φίλτρο

Οι πρόσφατες αναζητήσεις μου
Φιλτράρισμα κατά:
Προϋπολογισμός
σε
σε
σε
Είδος
Δεξιότητες
Γλώσσες
    Κατάσταση Δουλειάς
    2,000 import invoice data excel quickbooks δουλειές που βρέθηκαν, με τιμές EUR

    Η εργασία αφορά εισαγωγή δεδομένων σε excel ή σε woocomerce. Τα δεδομένα είναι προϊόντα για e-shop. Θα δωθούν αναλυτικές οδηγίες. Τα προϊόντα στον αριθμό ξεπερνάνε τα 1500 και θα δίνο&...

    €175 (Avg Bid)
    €175 Μέση Προσφορά
    10 προσφορές

    Αντιγραφή δεδομένων από word ή pdf σε excel

    €17 (Avg Bid)
    €17 Μέση Προσφορά
    8 προσφορές
    convert files Έχει λήξει left

    Μεταφορά δεδομένων απο word σε excel με βάση τα τμήματα και τις διευθύνσεις

    €20 (Avg Bid)
    €20 Μέση Προσφορά
    14 προσφορές

    Καλησπερα. Εχω ενα excel αρχειο με 4093 job titles. Δηλαδη ονομασιες επαγγελματων. Παραδειγμα: Σύμβουλος Ακινήτων Θελω να διορθωθει. Αυτα που πρεπει να γινουν &eps...

    €25 (Avg Bid)
    €25 Μέση Προσφορά
    5 προσφορές

    Καλησπερα. Εχω ενα excel αρχειο με 4093 job titles. Δηλαδη ονομασιες επαγγελματων. Παραδειγμα: Σύμβουλος Ακινήτων Θελω να διορθωθει. Αυτα που πρεπει να γινουν &eps...

    €34 (Avg Bid)
    €34 Μέση Προσφορά
    12 προσφορές

    χρειάζομαι κάποιον με γνώση σε opencart ώστε να εγκαταστήσει module import export xml, txt, xlx και με την απαραίτητη παραμετροποίηση.

    €27 - €228
    €27 - €228
    0 προσφορές

    Θέλω ένα φύλλο excel που θα αναπροσαρμόζει τις τιμές μιας βασης δεδομενων virtuemart σε joomla και θα εχει δυνατοτητα να αλλαζει το xml αρχειο για ενημερωση του

    €227 (Avg Bid)
    €227 Μέση Προσφορά
    1 προσφορές

    Καλημερα. Εχω ενα excel με αρκετα επαγγελματα. 3.500 στον αριθμο, και χρειαζομαι να βελτιωθει. Καποια επαγγελματα να βελτιωθουν και να μπουν ολα στις σ&...

    €21 (Avg Bid)
    €21 Μέση Προσφορά
    14 προσφορές
    Εργαστείτε στο Excel Έχει λήξει left

    Ενδιαφέρομαι για μερική απασχόληση. Δακτυλογράφηση, καταχώρηση στοιχείων μεταφράσεις κειμένων από Ελληνικά στα Αγγλικά και αντιστρόφως.

    €27 - €227
    €27 - €227
    0 προσφορές
    Εργαστείτε στο Excel Έχει λήξει left

    Γειά σας. Είμαι Χειρίστρια Η/Υ και επιθυμώ να εργαστώ ως freelancer μέσα από τον χώρο μου στον τομέα του Data Entry. Παρακαλώ πολύ στείλτε περιγραφή εργασίας. Κινητό:6973426452

    €455 (Avg Bid)
    €455 Μέση Προσφορά
    1 προσφορές

    μεταφορά από χειρόγραφο αλφαβητικό τετράδιο 25 γραμμών και 4 στηλών σε excel. Σύνολο Σελίδων 75 (μερικές είναι με λιγότερες εγγραφές)

    €129 (Avg Bid)
    €129 Μέση Προσφορά
    4 προσφορές

    Υπάρχουν τρισδιάστατα αντικείμενα, πέντε τον αριθμό, και χρειάζεται να γίνουν τα εξής α) Import the model in a FEA software b) Apply the constrains and the loads c) Select the proper type of simulation d) Create the proper mesh for each modelling shape e) Give the material properties f) Run the FEM simulation g) Reduce the element size for convergence process h) Compare the results with the analytical method results i) Discuss the differen...

    €107 (Avg Bid)
    €107 Μέση Προσφορά
    8 προσφορές
    Διορθώστε Κάτι Έχει λήξει left

    Εχω μια mailing list η οποία θέλει διορθωθεί.Από αρχείο word που τα έχω περάσει σε αρχείο excel.

    €18 (Avg Bid)
    €18 Μέση Προσφορά
    4 προσφορές
    Εργαστείτε στο Excel Έχει λήξει left

    εισαγωγη δεδομενων και πινακες

    €227 - €682
    €227 - €682
    0 προσφορές
    wordpress site βελτιώσεις Έχει λήξει left

    Σε wordpress site (theme...λειτουργεί παράλληλα με το SearchWP plugin 2. Το post format standard και το post format video να έχουν την ίδια μορφή. Να αλλάξουν αμοιβαία θέση η μπάρα video-toolbar-inner και ο τίτλος, για να υπάρχει ομοιομορφία....

    €222 (Avg Bid)
    €222 Μέση Προσφορά
    6 προσφορές
    Εργαστείτε στο Excel Έχει λήξει left

    Εισαγωγή δεδομένων στο Excel. .

    €22 (Avg Bid)
    €22 Μέση Προσφορά
    5 προσφορές
    Μεταφράστε Κάτι Έχει λήξει left

    να μεταφράστούν αρχεία excel, ( που είναι μια βάση δεδομένων για το ίντερνετ σε μια ιστοσελίδα ) τα αρχεία είναι στα ελληνικα και στα αγγλικά και ζητάμε να τα μεταφρά...

    €231 (Avg Bid)
    €231 Μέση Προσφορά
    6 προσφορές

    θέλω να εξάγω δεδομένα από sql σε excel, , δηλαδή να έχω κάποια σταθερά κελιά που θα πρέπει να ενημερώνονται κάθε φορά μετά την καταxώρηση νέων στοιχείων στο erp.

    €109 (Avg Bid)
    €109 Μέση Προσφορά
    1 προσφορές

    Θα ήθελα να ενημερώνω ένα φύλλο ms excel από μια βάση δεδομένων MS SQL την οποία χρησιμοποιεί το ERP (SoftOne) ως χώρο αποθήκευσης δεδομένων.

    €228 - €683
    €228 - €683
    0 προσφορές

    Θέλω να δημιουργήσω οικονομικές αναφορές στο excel που να αντλούν πληροφορίες απο την sql που χρησιμοποιεί το erp μου.

    SQL
    €185 (Avg Bid)
    €185 Μέση Προσφορά
    7 προσφορές
    excel macrocel Έχει λήξει left

    εχω ένα αρχειο xls πρότυπο και πρέπει να διαβάσει και να συμπληρωθεί απο περίπου 1300 αρχεια excel που βρισκονται σε φακέλους.

    €45 (Avg Bid)
    €45 Μέση Προσφορά
    1 προσφορές

    Στο συνημμένο αρχείο υπάρχει μία λίστα εταιριών. Θέλουμε αυτό το αρχείο να περαστεί σε excel, και να συμπληρωθούν επιπλέον στήλες με στοιχεία επικοινωνίας, (τηλέφ...

    €116 (Avg Bid)
    €116 Μέση Προσφορά
    19 προσφορές

    I need a proficient Excel user to create a workbook for my multiservice business. What I Require: - The ability to record both cash, check and card income, as well as expenditure for each. This tool needs to be able to accommodate and separate these different transactions for easy access and clarity. Desired Features: - It should automatically calculate the daily and monthly income for each category. - Must also offer a daily and monthly balance for cash flow. Skills & Experience: - Strong Excel skills are a necessity. - Ideally, the freelancer should have experience with creating business financial sheets. Timeline: - I'd like this project completed as soon as possible. Urgency is key.

    €361 (Avg Bid)
    €361 Μέση Προσφορά
    24 προσφορές

    I am seeking a skilled graphic designer to conceptualize a text-based / image-based logo for my company that emphasizes a professional appeal. I own a supply chain company. AMS Global Logistics or AMSGL. This company is global in nature and supplier services of the following: Import / Export Customs Clearance Container Transport Warehousing Key requirements: - Use primarily green color for the logo, signifying freshness and growth - The logo should project a professional image, suitable for a corporate environment - I prefer a text-based logo / Imaged-Based or a combination of both - creativity in typesetting, fonts or typography will be appreciated To succeed in this, you should have prior experience in logo design, color theory, and typography. Samples of logos you've des...

    €306 (Avg Bid)
    Προεξέχον Εγγυημένος Σφραγισμένο Κορυφαίος Διαγωνισμός
    €306
    7 συμμετοχές

    I'm in need of an experienced accountant to handle my bookkeeping tasks. Here's a bit more about the project: - **Service Type**: The primary focus of this project...Please, let me know if you have any recommendations or if you're proficient in a particular software. - **Transaction Volume**: On average, we have more than 100 transactions per month. So, I need a professional who can efficiently manage a high volume of transactions. Ideal candidates should have: - Proven experience in bookkeeping. - Familiarity with various accounting software (preferably QuickBooks, Xero, or FreshBooks). - Ability to manage a high volume of transactions. - Strong attention to detail and accuracy. - Good communication skills. If you believe you're a suitable fit for this role...

    €75 (Avg Bid)
    €75 Μέση Προσφορά
    9 προσφορές
    Lead Generation Specialist 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    ...Recognize and reward individuals who refer new clients to our company. What We Offer: Global Transportation Solutions: We provide comprehensive transportation services, including sea freight, air freight, and road freight, catering to clients worldwide. Customs Clearance: Our team specializes in handling customs clearance procedures, ensuring seamless import and export processes for our clients. Documentation Services: We offer a full suite of import/export documentation services, streamlining the paperwork required for international shipments. Customs Bonded Warehouse: Benefit from our secure customs bonded warehouse facilities, providing a convenient storage solution for your goods. Additional Value Proposition: Tailored Solutions: We understand that every client is un...

    €125 (Avg Bid)
    €125 Μέση Προσφορά
    38 προσφορές

    I'm in need of a freelancer who can assist me with the styling and formatting of an Excel spreadsheet. Your task will primarily involve applying cell style formatting. Specifically, I'm requiring assistance with: - Implementing cell style formatting. Please note that while the exact type of cell styles are not defined yet, I will be able to provide more details and guidance once the project begins. Ideal skills for this job would include: - Proficiency in Microsoft Excel - Previous experience with complex Excel formatting - Ability to work independently and on deadline Please, in your bid, include examples of any similar jobs you've completed.

    €64 (Avg Bid)
    €64 Μέση Προσφορά
    41 προσφορές
    Document Processes, Templates, & Request Forms creation 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    ...in creating my document templates and request forms. Key tasks: - Stand up your own Confluence and JIRA SM sites (free for 30 days) - Create process templates (Confluence), ensuring their accuracy and alignment with my requirements for internal processes for my SaaS product. - Create request forms (JIRA SM), with mandatory content and drop-downs. - Export the content in a form in which I can import them into my own Confluence and JIRA SM sites Ideal Skills and Experience: - Proficient in process document, checklist, and forms creation. - Ability to use Google, ChatGPT (or other generative AI) to search and create baseline content. - Experience with Confluence and JIRA Service Management. - Any experience with SDLC, ISO27001, incident response. - Excellent attention to detail. ...

    €61 (Avg Bid)
    €61 Μέση Προσφορά
    7 προσφορές

    ...versatile Project Template with Task Management features. In addition, I need a Work Order Template made that can integrate with D-tools for easy part number and work detail import. Key Requirements: - A Project Template with robust Task Management capabilities. - A Work Order Template that allows for moderate customization. - Direct integration with D-tools to import part numbers and work details. It's crucial that both templates are user-friendly and straightforward to understand and use. The Work Order Template especially must be set up to work seamlessly with D-tools, ensuring a smooth import process for the necessary data. Ideal Skills: - Experience in creating project management and work order templates. - Proficiency in tools like D-tools. - ...

    €461 (Avg Bid)
    €461 Μέση Προσφορά
    63 προσφορές
    Microsoft Azure Excel Data Hosting 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    I'm looking for an Azure professional who can help me set up an Azure cloud solution to host my Excel data. The project involves: - Hosting Excel Data: I will provide you with an Excel file, which I would like hosted on Microsoft Azure. The data in this file will not be updated frequently, just once for now. - Web Application: I would like the Excel data to be accessed through a web application. This means you will need to set up a simple, user-friendly interface for viewing and possibly manipulating the data. Ideal Skills: - Experience with Microsoft Azure, particularly in hosting data. - Proficiency in setting up web applications. Please get in touch if you have the right expertise, and we can discuss the pr...

    €63 (Avg Bid)
    €63 Μέση Προσφορά
    3 προσφορές
    Compact Excel Data Entry 6 μέρες left

    I am seeking a detail-oriented freelancer to input text and numerical data into 3 small Excel spreadsheets, containing 1 column each. 2 spreadsheets for emails, one called Minnesota, one called Midwest. 1 spreadsheet of inventory numbers. See attached. Only emails are needed. Inventory is on yellow paper Ideal Skills: - Proficient in Excel - Attention to detail - Knowledge of data organization and management Highlight the entries that you are not sure of, or the handwriting is to difficult to read. English fluency in a must.

    €19 (Avg Bid)
    €19 Μέση Προσφορά
    70 προσφορές
    Python-Machine Learning: Excel-based Customer Analysis 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    The task centers around leveraging Python programming and machine learning skills to perform data analysis. The data to be analyzed are contained in an Excel sheet, specifically focusing on customer data. The ideal freelancer for this task should exhibit the following: - Strong proficiency in Python programming. - Solid experience with machine learning. - Familiarity with data analysis, particularly descriptive analysis. - Ability to accurately interpret customer data. The task requires a reading of the Excel sheet and performing data analysis based on the customer data contained within. The chosen Python and machine learning expert will focus on descriptive analysis techniques to extract meaningful insights. Your insights sh...

    €34 (Avg Bid)
    €34 Μέση Προσφορά
    19 προσφορές

    ...have a detailed list of features I need developed, I'll share that document with those who are shortlisted for this project. You must mention "Dell" in the proposal in order to be noticed. Here is a brief for List of Features. 1. Invoice Currency Conversion using API and storing conversion rate in the database with date 2. Storing invoice value in base currency that is calculated based on conversion rate in the database so the total revenue is correct. 3. Invoice Custom Field Behavior changing, width of dropdown, custom field value and description 4. Invoice Total in Words in Customer Currency and Base Currency 5. Testing possibility to integrate Amazon S3 for file storage on Perfex CRM 6. Project Overview Screen, Task Details, Billing ...

    €320 (Avg Bid)
    €320 Μέση Προσφορά
    9 προσφορές
    Power BI Data Handling with PowerShell 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    I'm in need of an experienced PowerShell script writer, specifically for Power BI associated data management tasks. As part of the project, code will be required to execute the following tasks: - Data extraction from Excel files, CSV files, and SQL databases - Transformation of data, including extraction and update of parameter values from Data Models in each Workspace Ideally, the freelancer would carry a strong understanding and hands-on experience with PowerShell scripting, Power BI, data transformation techniques, and working with database source files like Excel, CSV, and SQL formats.

    €141 (Avg Bid)
    €141 Μέση Προσφορά
    13 προσφορές

    Hello, I have 6 simple contact web forms that I would like recorded into a single matrix. The goal is to see the field alignment and comparison between the form data.

    €13 (Avg Bid)
    €13 Μέση Προσφορά
    17 προσφορές
    Future Financial Projections for Construction Development 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    I'm seeking an expert data analyst specializing in financial data analysis for real estate development projects. The focus will be on the financial aspects of our upcoming construction project, specifically concerning future projections for the next 10 years. Candidates should be competent in: - Creating custom excel/ google sheet template - Forecasting Capital Expenditure - Predicting Cash Flow - Delivering revenue Projections Your role will involve analyzing, interpreting, and providing insights on these aspects. Proficiency in financial modeling and forecasting is a must. Knowledge about the construction sector will be highly regarded, and prior experience in real estate development is a bonus. To make informed decisions, we're relying on accurate and...

    €116 (Avg Bid)
    €116 Μέση Προσφορά
    35 προσφορές
    €12 / hr Μέση Προσφορά
    1 προσφορές

    ...features for user management include: user registration, login, and profile management. - For the payment system, you'll need to integrate a payment gateway, provide for invoice generation, and ensure that the system maintains comprehensive transaction history tracking. The website is already designed, so your task will be to add the necessary functionality to make it fully operational. Your role will be to ensure that the database is set up properly, the user management features are intuitive and secure, and that the payment system is seamless and professional. You should also ensure that the back office provides for easy data entry and retrieval, and that the system is highly user-friendly. If you're interested, I'll be happy to provide you with addit...

    €20 / hr (Avg Bid)
    €20 / hr Μέση Προσφορά
    39 προσφορές

    I need a skilled Excel professional to help me with data analysis and manipulation using the Solver add-in to solve optimization problems. Key Requirements: - Perform data analysis and manipulation in Excel - Apply Solver add-in to solve optimization problems Ideal Skills and Experience: - Strong proficiency in Excel - Prior experience with data analysis and manipulation - Familiarity with Solver add-in in Excel - Ability to interpret data to solve optimization problems - Attention to detail and accuracy for successful data manipulation Please include your relevant experience and how you can address the task described above in your bid.

    €19 (Avg Bid)
    €19 Μέση Προσφορά
    35 προσφορές
    UNI-CASE-Excel 6 μέρες left

    Es ist eine Aufgabe die in Excel gemacht werden muss, bzw Excel Solver bis 10.05

    €20 (Avg Bid)
    €20 Μέση Προσφορά
    11 προσφορές
    Administrador de Propiedades en distintas plataformas 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    La tarea sera la gestión completa de cuentas para los anfitriones de distintas pl...de propiedades. Necesitamos especialistas en atención al cliente que puedan encargarse de las tareas administrativas y la gestión de cuentas. Los requisitos para el solicitante incluyen gran atención a los detalles, título universitario, acceso al correo electrónico y conocimiento del uso de un dispositivo (computadora o teléfono), herramientas de software básicas (Microsoft Office - Word y Excel). Necesitamos miembros rápidos, precisos y especializados. Es obligatorio aprobar una prueba corta/terminar una tarea, que podría durar entre 2 y 4 horas, con posibilidad de extenderse hasta 1 semana, si el candidato está inv...

    €14 / hr (Avg Bid)
    €14 / hr Μέση Προσφορά
    27 προσφορές

    I am looking for a skilled Excel dashboard developer to build a proficient tool to track vital business metrics a balance scorcard. The ideal candidate for this job should have: - Expertise in creating user-friendly KPI and balanced scor cards dashboards. - Understanding of various KPIs including revenue growth, customer acquisition, and conversion rate. Key Project Details: - I already have specific KPIs to be tracked and would share them with you post project initiation. - The dashboard should be designed to automatically update on a monthly basis based on manual input that would be added to calculation sheet for each kPI. - The dashboard must be easy to read, understand, and interactive. - the dash board should include risk alert for KPIs we are falling behind in My expectat...

    €108 (Avg Bid)
    €108 Μέση Προσφορά
    30 προσφορές
    Accrual Accounting Transition Assistant Needed 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    ...cash-basis accounting system and propose a structured plan to shift to an accrual accounting system - Help the team understand the nuances of the new system for seamless operation post-transition - Regular follow-ups until the new accounting system is smoothly functioning Ideal candidates should have: - Proven experience with both cash-basis and accrual accounting methods - Extensive knowledge of QuickBooks Online - Excellent communication and teaching skills - Adaptability, patience, and an outcome-focused approach. We would love to chat with you to provide more details about the business and the need to switch our accounting methods. We would also like to hear your ideas on the best plan for implementing this. Please submit your bid and include the meaning of West Virginia&#...

    €233 - €699
    Σφραγισμένο
    €233 - €699
    27 προσφορές

    ...secure system for managing bookings efficiently. - A dynamic platform for sign-up as a tenant or owner with verification through email and mobile SMS code systems. - Email notification system, alerting after successful property listing and routing responses to the website admin. - An interactive admin dashboard showcasing all listings and consequent requests with daily and monthly statistics. - An invoice generation system. - A comprehensive control system for the admin to manage users and finances. For Tenants: - An intelligent search system for properties. - An integrated platform for making bookings and facilitating payments. The ideal candidate should have experience in creating similar platforms and proficient at writing an elegant, clean code. Understanding users' a...

    €307 (Avg Bid)
    €307 Μέση Προσφορά
    54 προσφορές

    I am looking for a WordPress developer experienced with Oxygen Builder and Metabox. Here are the specifications: - Develop a custom WordPress plugin that integrates Oxygen Buil...experienced with Oxygen Builder and Metabox. Here are the specifications: - Develop a custom WordPress plugin that integrates Oxygen Builder with the Metabox plugin I'm looking for a way to have a set of Group Fields to pull from a Metabox Settings Panel. And then import/ display them in the Oxygen Repeater. It needs to work exactly like it does with ACF. Oxygen is definitely not adding this feature anytime soon. So it needs to work on all Oxygen websites it is installed on. Your understanding of the plugin framework and intricacies of data synchronization is crucial for this job. Looking...

    €528 (Avg Bid)
    €528 Μέση Προσφορά
    94 προσφορές

    I'm looking for an Excel expert to develop an NSE options chain tool that will provide real-time data. The primary goal of this software is to facilitate educational purposes by explaining the basic concepts of options trading. Key Requirements: - Real-Time Data: The tool should be able to fetch and update real-time data from the NSE options chain. - Educational Focus: The content presented should be geared towards explaining the basic concepts of options trading in a clear and easy-to-understand manner. - Excel Proficiency: The ideal candidate should have a strong command over Excel and be able to integrate real-time data sources effectively. Ideal Skills and Experience: - Advanced Excel Skills: Proficiency in VBA and dat...

    €59 (Avg Bid)
    €59 Μέση Προσφορά
    11 προσφορές

    My main focus for this p...diagram and help me translate a class diagram into well-crafted Java classes. Key Tasks: -Create diagrams - Translate a modified class diagram into Java classes - Ensure the Java classes are correctly implemented according to the diagram Your responsibilities will include: - Adding products to the rental cart - Calculating rental fees and duration - Processing payment - Generating a rental invoice Your expertise in Java and software design will be crucial for this project. I anticipate that this task will involve a deep understanding of class design as well as an understanding of the rental business process. Please include examples of your previous Java projects in your bid, and any experience with class and sequence diagram interpretation would be a...

    €40 (Avg Bid)
    €40 Μέση Προσφορά
    13 προσφορές
    Excel Macros & Daily Status Reports 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    I'm in need of an Excel expert who can help me automate data entry and formatting tasks. I also need assistance in creating a macro to generate daily status reports. Key Tasks: - Automate data entry tasks - Automate formatting tasks - Create a daily status report macro Requirements: - Proficiency in Excel and VBA macro creation - Experience in automating data entry and formatting - Previous history of generating reports using VBA - Strong communication skills and ability to understand and translate my requirements efficiently.

    €111 (Avg Bid)
    €111 Μέση Προσφορά
    51 προσφορές
    Excel Formulas Expert Needed 6 μέρες left
    ΕΠΙΒΕΒΑΙΩΜΕΝΟ

    I'm in need of a skilled Excel expert who can assist with advanced formulas and functions. The main task will be related to carrying over formulas in both the same sheet and different sheets. Key requirements: - Advanced knowledge and experience in Excel formulas and functions - Proficiency in carrying over formulas across multiple cells and sheets - Ability to efficiently manage and implement complex formulas Your responsibilities will include: - Identifying the most suitable formulas based on specific requirements - Implementing the formulas accurately and ensuring they work correctly - Carrying over these formulas as needed across multiple cells and sheets If you're an Excel guru with a strong background in advanced formulas and functions, and are conf...

    €96 (Avg Bid)
    €96 Μέση Προσφορά
    91 προσφορές