turning off segments of a track

I have several tracks in my song. I want to sometimes have a lower track appear on screen, and other times have the upper track appear. So, I know to first use the scissors tool to put a separation, ie, in the upper track at the point where I want to see the lower track. However, I'd rather not delete that segment of the upper track yet, since I may want to change the timing in the future. Is there a way to just silence or turn off a part of a track. I know you can silence the whole track at the left of each track, but, as I said, I only want to quiet one segment of a track at a time. I guess I could use more and more tracks for each segment, but I already have a bunch of tracks.

Hope that's clear. I could reword it if needed.

LNovik