I remember asking for holds as they didn't have them implemented and I had to copy and paste endings in place of them.
Then PG made the holds by just recording them with a similar guitar as the original used by the Artist.
So basically instead of using a strummed chord that PG recorded for the holds/shots you would be using notes recorded by PG, so you would be going from a RealChord to RealNotes, same as here C:\Program Files\PG Music Inc\Band-in-a-Box Sounds\Programs\Guitar.
The Hold/Shots are too limited C Cm C7 CMaj7 Cm7 Cm7b5 Csus4 C7sus Caug Cm7#5
and you have over 100 chord types in BB and BB substitutes from the above list.
This was created with the chord picker tool, if I had to type them in you wouldn't hear from me for a month smile
https://www.dropbox.com/s/cxzdt3z6viqkek9/BB%20All%20Chords%20Holds.SGU?dl=1