After playing around with it a bit, and believe me, I'm REALLY rusty at this, what I did was to lay down the first style, the _BossaAPT style. I did the A part for it, staring at bar 5 after a four bar intro. At Bar 13, I put in a substyle, _BOS2SWG, the 'B' part. Now, this song plays about three times through, and will have multiple BIAB Soloists playing in it, but I ended up using SubStyles all the way through to 'N.' The Style choices seem to be limited to a more Bossa Style, I'm not sure where the more jazz orientated ones are, but I'm sure I'll figure that out eventually.
It is entirely possible that if you start out in a Bossa style you can't really switch over to a jazz style. Kind of like going to Country to Opera, maybe. I'll play with it some.

I still am not sure how to, or even IF I can save all the sub style parts into a single MultiStyle that uses elements from other styles. I'll keep working on it for a while yet.

Thanks for the answer, though.

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!