Normally you just select all notes on the key and move them to the key (hit) you want, if you can hear the notes (hits) as you move them that is great, but in mne I can't hear the notes like in other piano rolls in other DAWs. You can try MidiMapper it will remap the midi file to different drum VSTi's. You can also put the song in RealBand and just drag n drop the grooves out of Kontakt groove library to make the exact drum beat you want.