I was able to successfully have it switch styles by picking a bossa style then adding a jazz swing style as the C & D sections and assigning those sections to bars by right clicking on the bars. so my problem is solved.

IMHO BIAB is better for practicing jazz tunes than IRP when you are a bass player as it plays the melody and solos.
playing bass lines under that is better training and more fun .
if I was a horn player id probably not bother with it and just use IRP

thanks
david