If you want (need) to go back to BIAB and export individual RT from specific track, instead of all, you can:
Right click on the track header>Track Actions>Export Track as Wav file.
Probably not the "best" practice, but saves time when you need to audition things fast, when you already got project going in DAW.
I do this a lot. Often I will regen the performance to get a slightly different take on the instrument.
I do not use the Plugin for this either.
I have 2 monitors on my desktop, one with biab and the other with my daw(Logic Pro X).
I often use the little File export icon (Below "Master"- top left of biab window) and drag tracks ad hoc to there.
Once the Green means go light turns on I drag them to my DAW and a new audio track is created.
For me its a great way to create and audition various additional instrumental voices for a project.