SW2010 SP3.0

I'm modeling up some old parts from hand drawings from the 70's.

One of the parts is bent from 1 inch plate, which makes me want to model it as sheet metal.

As far as I can tell tho, SW will only let me cut the sheet metal perpendicular to the face, but I need to cut 5 deg from normal.  Cutting at an angle just seems to make a larger normal cut.

Is there a way to make an oblique cut in a sheet metal part while keeping the ability to unfold?

Thanks,

Brent