I see where Multipoly can be used to join polygons (and) and subtract one polygon that's completely contained in another but when I put one poly on top of another to cut out a section (like an inlet in a landmass) it's subtracting where the polys overlap and creating new "land" where they don't.

Is there a way to tell CC3+ "I want to remove where they intersect and ALSO remove all of "B"?