There might be a few things to clear up regarding my workflow. There might be more efficient ways but this is how I work. I do take 1, 2, 3, ect sequentially so if the song is 96 bars long with a 2 bar count-in then take 1, beat 1 would be on beat 1 of measure 3. Take 2 would begin the count-in at measure 101 and the downbeat of take 2 would be beat 1, measure 103. I don't stack my takes. If there are guide tracks or markers/tempo changes I just copy all that stuff and paste it further down the timeline. I really only do this for getting the basic tracks for a song. Once I have the drum take all the overdubs happen within that best drum edit. Sorry for the long description.
Now that I have several takes of the song and we have decided on the main version we will work with we might do a few passes and certain transitions, fills and any other feature parts. Those would be even further down the timeline. Once we have selected all of our replacement parts I generally select the part that I want with the grid turned on and then copy the exact part I want. I will then go to the place in the main performance and replace it by pasting the new part in and replacing the old one.
It's at this point that the grouping would come in very handy. As you all know, the crossfade on an edit can really make or break a seamless edit. In the past I have manually selected all the clips in the section I want to work with the lasso tool and go about making my moves. Sometimes the best edits require finessing the edit tool that moves the end of the first clip and the beginning of the second clip simultaneously managing the crossfade. I have found that these edits do not necessarily work across the selection group the way it does with the two clips in question, (Damn, this is hard to describe). Because of this I have to go through and slip-edit each track to get a clean edit. If I could make a group for the preceding section and a group for the replacement section then I could accomplish this in one move instead of 10.
What ends up happening when I try to make a clip group with a section I have cut the beginning and end of, it will make a clip group of EVERY clip in the track and not just the clips I am trying to turn into their only little unit. The result is that I cannot do any sort of editing because it just does completely useless things when I try to edit a crossfade or anything.
My conclusion is that it doesn't work at all (which I have decided is incorrect), I'm totally misunderstanding what I think it should do and it's working perfectly, or that... I don't know what it is supposed to do and I am misusing the feature. I should probably make a video or something because it is really hard to describe something that doesn't work as I expect it to work.