I'm using Sprutcam9.

Sometimes I want to machine faces as if there wasn't a feature like hole that intersects the surface. Case in point when using a plane machining operation this cutout creates a tool path that has engagement on the parts surface in the z axis which is something I don't want. It would make more sense to "cut air" across this feature.

I can't figure out how to edit this face or draw a new face. The only workaround I have found is to edit the part in my CAD software and import two CAD models. Does anyone know a better way?