Knockout and Tracking

Howdy. Forgive me if this has been answered before, I didn't see anything on a quick search.
I'm working with a long timecode cuelist using tracking. I have a good understanding of tracking, but there's something I can't figure out. I want to clean up my cue editor spreadsheet.
Lets say I use fixtures 1-8 at 100% intensity in cue 2.
In cue 3 I turn the intensity to 0%.
I won't be using these fixtures again for the next 50 cues.
Instead of having them populate my editor sheet through the next 50 cues tracking at 0% and making a mess, I want them to go away and keep my editor clean. Knockout doesn't seem to work.
Any tips on how to accomplish this?