With RealBand you just set to snap, highlight fill you like, hold Ctrl+Alt, drag, let mouse go first.

You can also go to your bb\Drums folder
find the same drum you are using with the closest tempo
drag it into the very start or onto the volume slider of an empty track
select the whole track by Ctrl+click or Ctrl+A
right click track > Time Stretch & Pitch Shift....
enter old tempo (in the filename) enter new tempo that RealBand is set to
with Snap off Ctrl+click to select whole track
drag to very start if not in sync with original drums.
now you can copy sections, and at the very end of the track there are hits you can highlight without Snap on, > Ctrl+C > (set events only) Ok
set Snap on again, now set cursor where you want to paste the hit
Ctrl+V > select events only and Merge audio to merge the hit with existing drums.

Video demo
https://www.dropbox.com/s/wa6jp7gm09f0pab/RB_Drum_Intros_MultiRiffs.mp4?dl=0
If it ask for Sign in click No Thanks Continue..at the bottom. Download if not playing clearly.