Charlie, I understand what you are trying to explain... I do not think you understood what I was aiming at.

Ok, I got my Chorus/Verse/ending figured out. And... I want to work on intro now. So I insert 2-3-4... as many bars as I need at the beginning, but lets say I do not like the drums that are present in A or B for my Intro... I want to use parts of style C and parts of style D for the intro.

Tinkering with style changes at first intro bars, after I assembled most of the backing track, did not work for me on several occasions. Commonly 3 things that happened: a) unpredictable results b) song would just not play (nothing happened on press of play button) c)All chords would turn red. would start playing and then stop.

Basically, funky things start to happen when I start to completely overhaul intro of already established composition using style change from the start of the song.

The easiest way I found was to completely redo intro is to assemble a new project in BIAB just for intro, output it to separate WAV files and do a little collage in DAW of choice