How about this ?
At the "Rythmn Ending" Measure, Punch Record(CTL)a "Fill-In". Then Copy and Paste the measures you want to use to extend the song after that fill-in.
I would think that would provide a nice transition for the newly copied mesures.
Will that work? Will Punch Recording a fill-in over ride the ending ?

I guess I should just try it, uh ?
PS Not to dwell on it, but I agree with Bob. If your select "ending delete"...it should delete, or it least it should be explained in the owners manual that you can't delete an ending this way.(Walt is right about that)
Alex, thanks for the Punch Record Tip. It is a tool I should be using more often, although a little tricky to grasp.
SeeYa
Larry Hawk