[Stiglr]

Still not working.

Here's what I'm doing. I'm trying to cut a passageway opening in a bulkhead in an aircraft. The bulkhead is a section of surfaces on the inside of the "Fuselage" object. The "hole" is an extruded polygon placed to intersect the bulkhead. I can clearly see two sides of the "hole" object out of each side of the bulkhead surface.

Open Tools/Boolean Operation... .

Select the Fuselage. Click into Operand B, and click Set.
Select the Hole poly. click into Operand A, and click Set. Click Delete.

Select Subtraction, B-A.

Click OK to make the operation. I'm assuming A, the Hole will be cut from B Fuselage and that A will be deleted, leaving a hole in B.

All that happens is that A "disappears. B has no hole in it.