Could you please give me the correct process for cutting out (cutting right through) custom shaped sketched areas on sheet metal parts. I've investigated 'trim' options and 'extrude cut' options but don't think I'm on the right path with either. I have attached both an image (below) and the part as a .zip file for your review. I am not after someone to just do it for me, I need to know the correct process so that firstly I learn, and secondly, I've got quite a few custom shapes to do.
Appreciate any and all help.