Good advice above. Here's a different approach.

BIAB may actually be doing what it's designed to do by default. The random generator may be bringing in perfectly good patterns to vary things and hold your interest, but you don't want it to do that. Here are two things to try:

1. If you like the pattern of the A substyle (the blue part marker), but in the middle choruses of the song it starts playing something more 'busy' (what the green part marker causes), that is normal but you can turn it off. Go to Options, Preferences, Arrange, Overrides. Uncheck "Vary Styles in Middle Choruses". While you are there, look at all the checkboxes below, where you can Force a track or tracks to Simple Arrangement. Experiment, and regenerate the song each time.

2. When you click on a RealTrack in the mixer, go to Select another RealTrack. Select the same one but this time look for a checkbox that says Simpler, and check it. Do this for each RealTrack that is causing problems for you. Note that not all of them have this option.

Then, there is always the audio editor/DAW/cut and paste approach as mentioned. But the above tips may make the original more like what you want.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.