as a general rule, when you open a BIAB song, you'll probably want to go ahead and generate the song just as you had it in BIAB. Even without the ACW, the chord window should be populated with the same chords that were in BIAB.

In RB you have separate windows for tracks and chords. After you've generated the songwithe the same chords, you can go to the chords window and make changes to the chords there. Then if you regenerate any of the existing tracks or if yoy create a new track, it will follow whatever chords are in the chord window at the time of generation.

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0