the descripion is in the upload files
the only milestones is the 20%, the rest of the project just release when the project work 100% good like the document requirement
25 freelancers are bidding on average $615 for this job
I have been working on the Odoo project since last 5 years. During this tenure i have worked with lots of data maintenance projects. I think your requirement is not much complex .We can achieve this gracefully.