I am new to Solid works and am trying to make a 3inch OD 90 degree pipe with the inside of the elbow being square. I have the geometry drawn and by using the sweep boss base I can create the elbow either solid or with a round ID. I have the square geometry drawn were I can sweep it around the same path but cannot figure out how to do the id and od at the same time or how to cut the id out of the elbow. I would love any help.