Usb cassette tape production diary

I started by creating a simple cuboid with the parameters 55mm by 35mm by 6mm. Then using the similar method as the usb plug i then created 2 circles and a rectangle. After turning these shapes into an editable polly i then selected the polygon selection. And selected extrude, the amount wasn't important as it was designed to go through the cuboid. Now after i placed them through the the cuboid i went to the create control panel and selected compound objects menu. Here i was able to select boleon and using this and selected the operant b and the 3 shapes this deleted the intersections.