how can i draw a cube in gambit which has some other faces on it ?
 

hi,dear friends.
how can i draw a cube in gambit which has some other faces on it ? I draw it & determine boundry conditions but when reading in fluent some of them were disappeared .
for examole for simulating air flow in a room ,it's walls have different boundry conditions like ducts , fancoils & ie... what should i do?