Auto increment Key

I have several files (tables) that have a field defined as auto increment.

When I make a copy the new file works fine, but if I add records to the
original and pass them to the new file using "CPYF *UPDADD" both files
become identical, but if I insert a new row in the copy, it uses the
auto-increment from the time I created the file.
"Alter table" fixes the problem, but I wish there is a "more automatic"
way to synchronize the restart for the auto-increment field in the new file.

Any experience? Ideas?

TIA
Raúl

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