Daisuk
2
Copy the pattern you have and paste it into a new pattern. You’ll have an identical pattern, where you can simply remove the trigs from the tracks you don’t want, or clear the track of the track you want the trigs removed from. I can’t remember the exact button combination for clearing a track, but it’s in the manual. Check it out, probably under “Programming patterns” or something similar. This will achieve what you’re after. Although it’s a bit of a different workflow, you will become pretty fluent at it fast enough. 
Function + Rec/Copy button for copying pattern, Function + Stop/Paste button for pasting.