Please Help. Not seeing a "Drum Map Manager" section offered in BandLab?

[FunkDaDevil]

[Chaps]

You can access it by clicking the little arrow next to the output of a MIDI track. There may be other ways to do it, but that works for me.

[scook]

Click the "Advanced" radio button at the bottom of the Preferences page. 

Or use the output drop down on MIDI inspectors and track headers.

Or the output drop down on the inspector MIDI tab for instrument tracks.