I don’t do any multi-channel file work but when I’m mastering stereo stems in the box, I often need to do some editing equally to files on all the tracks in a montage, things like trimming, fades, adjusting volume envelopes, and moving around etc.
To do this I make sure the clips that I want to edit are selected (highlighted), and then hold OPTION while I perform the edit to one of the clips. In most cases this will edit all selected clips.
There is also a way to group selected clips but to my confusion, when clips are grouped and you go trim the ends or apply fades, it only happens on the one clip you apply, not all of them.
Because of this, I never actually group the tracks, I just select the clips I want to edit as a group, and hold option while I do my edit.
I’m using OSX, so if on Windows it could be different. With OSX, the OPTION key is helpful.