You export the entire figure. And the best place to ask a question about the practical guide would be over in the zbrush forums.. those guys are on top of everything, and you'd have had an answer in a hour or so. The BEST place to ask zbrush related questions is the zbrush forums, hands down. Some poser artists are beginning to get a handle on it, but the real zbrush gurus are over there.

Way too many people take way too many things way too seriously.