Hi Larry,
my understanding is (and this is only off the top of my head, so someone correct me if I'm wrong)

copy measure- copies an existing measure/s ( notes & all) to where you nominate.
whereas inserting measure, will insert a blank measure, where you nominate.

Also I can't see why you'd need to delete your ending. but?

I don't do a lot of sequencing of songs, but I do use the sequencer at times for style creation. If I get a chance, I'll do a bit of fiddling around and see what I come up with if you're still having problems.

best wishes
Rikki