So this is a section of a part of a model of a jail I am working on, but when I built it I didn't allow for the door to look like it would actually open. So now I need to go back to my model and make some cuts. I quickly went into photoshop so that I could indicate how I am thinking that I would like to cut this frame. I made this from two rectangle splines inside a spline mask then put in an extrude nurbs. Can I delete part of the spline?

Thanks,
Steve