Slugbaby
 
I don't remember the process step-by-step, I only comp vocals when I'm recording a "final" version of a song that I'll be putting up for public consumption/sale, which is every couple of years.
Basically, I select each clip that I want to use.  Then, it's the only clip that's audible.  At that point, i Bounce To Track.  That gives me a consolidated track of these clips, and I then archive the Comp Takes.
There's a step-by-step video somewhere on YouTube, showing how to utilize it.