Hello!
Kindly provide me the criteria for copying your documents from root root library to a sub-site library and also provide me with the exact structure for running your workflow in the correct way. I have done a lot of workflow development projects that works with SharePoint on premises and office 365. Some of the examples of my workflow development includes document approval, leave request, document feedback. So, I can help you in developing the workflows as per your needs.
My experience revolves around SharePoint Development (2016/2013/2010/2007), Custom Web parts, Workflows (State Machine & Sequential), Timer Jobs, Event Receivers, Feature deployment and Packaging, SharePoint Designer, SharePoint Branding, SharePoint Master Page Development, HTML, SharePoint InfoPath Development, External Content Type-BCS and Office 365.
I would love to discuss further about your exact requirements. Please let me know your availability for an online meeting. Project cost will be decided based on the requirement finalization.
Regards,
Amit Master.