OK, this is what I tried and the results.

As an aside: BiaB won't allow me to have no chord on beat 1 of bar 1, when I generate it adds the chord from the key signature on bar 1 beat 1. So I just add a period to make it a rest, and it doesn't play. OK.

1: My chart looks like the first image and plays correctly.

2: If I try Edit > Copy Special > Copy Rests... to copy the rest from beat 2 of bar 1 to bar 5, it doesn't perform anything, as there is no note on bar 5 (see second image)

3: I add a note to beat 2 of bar 5 (see image 3)

4: and perform the copy again, and beat 2 of bar 5 now has the Shot rest. (see 4th image)

Note that it is important to select the Beat as well as the Bar number from the source



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