Sorry for the confusion. For the song at top of this thread, Guitar Stu’s Proud Mary with Bass, you need a kit that has the bass in midi spaces 63 through 91 in the BB kit. You could try the sub-standard pro kit:
Use the 63-91 version.
To delete a drumset from BBM, not BBMO, go into the drumsets list on BBM
Then, select the kit you want to delete.
Then from the upper menu bar select Drumsets
then Delete Drumset.
The process is likely somewhat different in BBMO. I have not used BBMO enough as yet to give advice on its use.