Imagine your BIAB composition as a layered cake. Next level of arrangement should easily allow you to take a slice of that cake and place it exactly as it is anywhere in the composition. Unfortunately, Biab doesn't allow that to happen. In my humble opinion, when you make a selection in Chord Sheet and you want to carry it over (cut/paste) or "copy to" location: It should have an option to copy all of the data in that selection, including all midi events, all audio data, all frozen sections, and carry it over or duplicate exactly as it is to any place of your tune.

P.S. Going further, "freeze slice" would be an excellent addition to that feature too, which would let you freeze entire block of the song, while having the rest in liquid state.

I think the benefit of this is self evident.