I'm totally new to 3D design software. I need to align a plug in one part to a socket in another. The plug is fixed to a PCB but the socket I can move around. My question is how, in assembly mode, can I make an extruded cut in the part that has the socket so that it lines up with the plug? It's easy enough to make an extruded cut in Parts mode but not in Assembly mode. Or, is there some way to put the part with the plug and the part that needs the socket on the same coordinate system?