There are many tutorials on youtube showing you how to cut solid parts using a surface as a boundary. However I have a large knitted surface and would like to cut a unique shape out of multiple surfaces. Is there a way to sketch up a shape and use it to cut the surfaces? So far I've had no luck with just about every function you could think of (surface trimmer, delete surface etc.) It would be fantastic if there is a way to make an extruded solid and use that as a boundary to cut your surface.

Any ideas?

Thank you for your time and input

The picture attached shows the surface and the general shape of the sketch that I want to cut out of it. Essentially I want to turn the coupe into a convertible.