I am following a tutorial on making a Batman with Maya and Zbrush that is on this website. Most important moment are being just glossed over so I have no idea how did this guy do certain things. One of them is like, he does Quad Draw to retopologize Batman mask sculpt but than he wants do to separate part for his chin. And somehow he manages to have 2 quad draw surfaces in the same session. I have no clue how he did it. Does anyone else know? Because once your mesh is LIVE that's it, you can't have it live for different parts it;s either on or off. He did it off screen (which defeats purpose of the tutorial of courser) so I have no clue how he did the trick.
So these 2 parts are physicialy separated. That's the trick.