Creating MIDI drum loops for AD2

I have a bunch of songs with GM midi drum tracks.
 
I would like to slice up the midi tracks into 2 , 4 or 8 measure chunks and make midi loops for use in AD2. Separate the grooves, the fills, the intros, outros, etc.  Then I could use them to build other tunes.
 
So i guess the question is what is the best way to make midi files? I tried in Sonar but I can't find an easy way to export a the highlighted part of a clip to a midi file.
 
I know how to import midi loops into AD2 external midi folder, that is not the problem.
 
I did a little testing regarding the GM format. If I set the mapping to GM in AD2, it will use GM clips of course. but it will also use the clips from the official XLN libraries and Groove Monkee AD2 format groves. So evidently format is not too important for my purpose.
 
Just way to slice and dice the midi drum tracks into smaller bits.
 
Any ideas? I suspect I am missing something rather obvious but I didn't find anything in a search.
 
Thanks
 

I do this all the time. My favourite place to get the files used to be cool-midi.com but this is really dodgy now so try somewhere else. Just download a song and import it into SPlat. Allocate the tracks to TTS1 and have a listen. Put markers for verses, choruses and those all important turnarounds. Chop up the drum track and label each clip...v1, c1, t1, v2. I sometimes Ctl+L to make them proper clips but have had fun and games with that in the past.You can get some really modern 'in the moment' stuff there. Great for inspiration!
I then drag the individual clips out to an open directory - just organise it however/wherever you want.
When in your session I would simply pull the bits onto a track again from a file explorer window.

what I typically do is drag in the whole "midi 2" clip in to Sonar.
This will, by default open multiple tracks (different instruments)
Visually identify the drum track, delete the rest of the stuff, then slice up the track in the Track view.
Add AD 2 by using Insert Synth, then drag the parts in to the AD 2 track.
 
Then by opening the PRV you can detail each note if you choose.
 
To be perfectly honest, writing Drums in the PRV is easy and more fun than just using someone elses drum loops.
I made this video about 3 years ago

Enjoy