Making cavities in polysolids

[bajaj1]

I am building a house, I made all the exterior walls using polysolids but I need to add doors and windows. Thus I am looking to make the cavity in polysolid, and insert a door or a window, any ideas how to do that??

[Patchy · Accepted solution]

You draw the perimeter of the door and the window, PRESSPULL thru the wall, then SUBTRACT them out.