Do you mean to be able of create a room which you can manage and from which you can get info like the area, while it remains invisible (white) in the plan instead grey?
I speak of the plan only because in the 3D view you can simply uncheck the "show floor" and "show ceiling" checkboxes, but certainly it cannot be "hidden" in the plan.
----------------------------------------
If a long walk every day were healthy, mailmen would be immortal.
