How to edit multiple tracks exactly the same?

Well this is a long and challenging subject. There are a number of really good tutorials in the blog and also on youtube. Here are some basics of things you can do. 
 
First, I would put your current drum tracks into a track folder if they aren't already there. Then I would bounce each track to a new track and put all the new tracks in a different folder. You can file away the original tracks so you have them in case something goes awry you'll still have them. 
 
The new tracks in the new folder, since they are bounced, won't have any take lanes, just the parts you kept. 
 
Next select all the tracks in the new folder and create a clip selection group. Clips > Create Clip Selection Group.
 
The clip selection group will allow you to do the same thing to every track in the group. What you want to do is split all the tracks at selected points. You can split them at snare hits, kick hits, high hats, or whatever you want. Where and how you split it depends on how good the drum tracks are, whether you want to just fix a few things or whether you want to fix a lot of them. 
 
If you have just a few places you want to split and fix, you can just tab to the hits you want to fix and use the split tool, or right click and select split to split at the locations. It will split everything in the selection group at the same place.
 
If you have a lot of things to fix or if you want to quantize most of them. Then you can do the following on multiple tracks if you like, snare, kick, etc. I'll just describe how to do it using the snare track as a guide. Follow this same procedure using other tracks if you want to do those to. 
 
Turn on transients on every one of the tracks. Set the threshold on the snare track to something that looks good. Then set the threshold on every other drum track to 100% such that NO transients appear.
 
Go to your snare track and edit transients as you like to make sure you have what you need on there. Once you get them set, select the group (all the drum tracks). There should be no transients on any tracks except the snare track, right click the snare track and select "merge and lock markers." That will copy all the markers from the snare track to the rest of them and lock their position. 
 
Now you can open up the audio snap palette and select the "audiosnap split beats into clips"  button.
 
This will split all the clips at the transient markers. Once you do this you can quantize all the  clips with the quantize button in audiosnap. Be sure to select "audio clip start times" in the quantize dialog so it lines up the start of the clips on the grid, which is where you cut them. That will also engage the "auto crossfade clips" box which you'll want as well. 
 
Be aware that if your parts aren't good enough, you may not get good results. If the parts aren't that great, you might like to just keep the transients on the "2" and "4" of the snare (if I'm only using snare) and then you can quantize on the 1/4 note easily and go from there. All this assuming 4/4 time. 
 
If the part is really bad and needs lots of work, don't be afraid to do this procedure on the snare at 2 and 4, get it all sounding fair. Then "bounce to clips" each track and start the process over again. You can do this until you get it all right.
 
Another trick. If there are fills that are rushed and are off enough they won't crossfade well. You can cut the fill at the beginning and end and then stretch the clip of the run to end at the right place. Do that by selecting the clip of the fill and doing Process > Fit to time..
 
You'll learn other tricks as you go along or post here and we'll help. A bit of patients and a lot of work and you can pretty much make any performance work well. 
 
Some times I like to have the drummer just let go and play instead of being conservative to keep from making mistakes. You can generally fix mistakes, but you can't fix a conservative part into a cool one!!
 
gabo