Great, I hope that makes it a bit easier for you. When Real Band first came out a lot of long time Biab users thought it was just Biab with some enhancements. It's not, what it is is a complete DAW with some Biab features.
What I do most of the time is create the song from scratch in RB, I won't use Biab at all unless I want a midi soloist. If I happen to have the song in question as a Biab song I may open it up in RB just to get the chord grid but that's it. The biggest thing to remember is the fact that RB is not limited to using just one Biab style. The first 8 tracks will open up as Biab if you have it set that way and those tracks will regenerate if you change styles just like Biab will but to me, why bother with that, if that what you want to do just use Biab in the first place. The big deal is mixing in different styles on a per track basis along with any other midi or audio tracks. I just finished up a tune that started out as a good midi file I found on the internet. I started by cleaning up the chords. The automatic chord detection from a midi file is decent but not perfect. I kept the guitar, drums and bass from the midi file. I added a Biab guitar part using one of the rock styles, two piano parts using one of the country styles and a rock style, I then generated two different Real Drum percussion parts to mix with the original midi drum part and I recorded my keyboard for organ and strings. I played with the part markers with each one of the Biab tracks and probably tried out 3 or 4 different styles for each track. All of these different parts were used in different places in the tune. For example I didn't use the RD's together at the same time, one went one place and one went another place depending on the original drum track.
When you realize just what this program can do, you also realize it's an incredible program, nothing like it anywhere. Some will post questions about how does it compare to Sonar Producer or some other big name DAW. There's no comparison at all because nothing else will allow you to open up an existing song be it midi or even a studio production with real players that you decided you want to add some rhythm guitar to and you don't want to bring back and pay for a player to record. No problem, click on any empty track, select a style, select guitar and start playing with the myrid different Real Track guitar parts and/or the Biab midi guitar parts until you find one that fits with your prerecorded tracks. People will say you can do that with loops and you can up to a point but loops are not going to follow your chord changes automatically. It's a ton of work to get loops to do that.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.