Quote:
Now I would like to reload back into BIAB to add additional tracks and drum fills at certain spots

Again, you can do this in RB far easier than BiaB at this point and not lose any of the control you have now.

Select a new track
Highlight the section you want to generate the new part on
Click the desired Generate path and just generate the new part in RB.
If you want something different regenerate that section again.
I think you'll find this much easier (and in some ways better) if you just stay in RB.

Once you have the new section you want, cut what you don't want from the original track if needed and let the new track replace it.

I do not work here, but the benefits are still awesome
Make your sound your own!