Michael, thanks. Both of those solutions work excellently. Excuse me for not uploading a scene- I assumed that really simple things were easy enough to recreate.

If you scale an uneven curve a "flat" message will appear letting you know it is planar and can be used for Boolean and Trim but is there a way to flatten at an angle? I have a wavy surface, created a curve on it using surface snap but Trim and Boolean don't work. If I scale on an axis it will ruin the shape- I need it to flatten at an angle. Scene included.









Frenchy, I think I have recreated your gif but I can't get Network to work like you have.