Ongoing development with data entry - concern
I've been using Filemaker for a little over 6-7 months now, and I got a little side job from a friend to develop a FileMaker Database for his business.
I'm already several months into this development and have given him a "rough draft" version of the database That he uses with his iPad. He has entered data into it and I have furthered development of the database separately from him adding data. I've added layouts and scripts and more databases. I do my work on FMPro and he is using FMGo to do all his data entry.
My issue/concern is how to "join" or "sync" the two pieces together to prevent data loss when I improve his "rough draft" design I gave him into what I currently have.
What is the process to do such a thing.
Thanks to anyone who can help me with this.