so I have a customer part I need to modify, in Auto Cad Mach. I would just delete the faces and extend the surfaces and be done. Extend surface does not work, Ruled Surface does not work, 3D sketch does not offset so I guess I do not know how to go about this in solidworks.  I basically need to unfold this extrusion and so far everything I have tired does not work. This is NOT native solidworks data. So any I would appreciate any help on this matter this is something that has to be done on a regular basis.