Gambit: creating volume from a group of faces
 

hi
I try to do an optimization process on a heat sink using Matlab which calls fluent and gambit. In fact, I'm optimizing the number of channels in a microchannel heat sink.
but the problem is that i have to create a volume in gambit with unknown number of faces (which is interface of microchannels with the base metal of heat sink)
I mean, using gambit and "stitch" command, you have to call all the faces at once and as i duuno how many faces i have, i' quite stuck. :confused:
i dunno what to do, i've tried creating group of faces but then i saw that i cant create volume from groups and DO LOOPs are not useful here either.
Please help me through
I appreciate any comments