Yes, it is all the flexibility you get with SONAR and assigning inputs....
1) After I assign mic groups to OUTPUTS in BFD, I then name the SONAR tracks to meaningful names that match the BFD output channels... let's say you route the OHs in BFD to STEREO 1 and 2... I then assign the STEREO 1and2 as input to a track in SONAR that I would name OHs, then do each of your output assignments the same way.
For my workflow, I end up with a stereo output for the OHs, Rooms and other ambient mics, MONO outputs for the KICK, SNARE and Hats, and another stereo output for the TOMs.... and I just mix in SONAR at this point to taste.
I hope that helps. I still am trying to learn how to route stuff in BFD3.... I want separate outputs for the ROOM, OHs and other ambient mics.... I can't seem to get a separate track in BFD3 for each of these yet but I know I will figure it out for the ultimate flexibility.
BFD3 is now my leader for drum VSTi out there. So much flexibility and so realistic. You gotta love em.
Jim