Hi TJ
your selected drum style, by default will play as sub-style A. Most have a sub-style B too.
Every place you want a Fill, highlight the Bar you want it before blue for A and green for B. If you go green (for B) remember that it will stay as B until you tell BB to go back to A by highlighting the next bar blue again.
AFAIK you will always get random fills from the RD styles 'library'.
What I have done in the past is,when it plays the certain fill I like at some point, is to Freeze the track, export it to RB , or your DAW, and do a cut and paste job on it, replacing any randoms you don't like with the one you do. Laborious, but it works.
HTH
ian


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