Simo, if you'd put the attitude in the closet, you might learn something. The method you're talking about is for emulating sub-d modeling using a POLYGON cage (which can be done with maya's poly proxy, CPS, or sub-d if you have unlimited). The purpose is to work on a low poly cage while the actual mesh is smooth. With NURBS you model it directly...no cage...it's not polygon. Flamenco probably thought you were talking about the idea of modeling one half of a character and instancing the other side to have it update automatically so he WAS trying to help you.

If you KNOW this already, that's great. If people aren't understanding you, try to clarify your question better instead of copping an attitude.