Bill,
It sounds like three questions (at least) in there.
The first is how the relationship is resolved, and the logistics of that.
As to extracting a set of patients and placing them into a new AC database, that can be done and we (and some others) could assist you with that if that is the path that is chosen.
The third question would be how those charts are notated so that it is cleaar which patients left the practice.
