creating cuts on a volume
 

hi
in gambit I want to creat a circular cut on top of a cylinder but it says "the requested operation can not be performed because the face of the cylinder has upper topology" do you know how it could be done?

*post picture
*Real or virtual geometry?

the volume is real. how could it done?

if your volume is real, than a simple split with any surface cutting entirely your volume should be successfull.
But the message you posted, sounds like you want to delete a surface, an edge or a vertex which belongs to your volume