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In architecture we cut a lot of holes in solids for stairs, skylights, windows and doors and just plain openings. With window/doors we have a way, albeit with limitations in BC
I have put in a support request after speaking to Jason re this. Has anybody had any experience in this area of generic subtraction solid that works in all UCS planes
1, SEt UCS and draw a closed polyline
2, Create subtractsolid from this and put on relevant layer
3. Probably need to block like a window/door. You cannot edit the anon blocks BC creates for this
4. Cut the plain opening. You can leave as a hole or insert a block for stair (thats another topic), skylight, custom window/door etc
Roy has written a very good roof from polyline routine that does hips, gable and monopitch roofs from a 2d poly in xy plane , and usiing add/subtract you
can easily modify a roof. Extrude to path adds gutters etc.
Cheers and thanks