Smart Extrude

Smart Extrude allows for a partial cut-through on an Editable Poly object.

Smart Extrude's partial cut-through functionality found in update 2022.2 is now available in the Edit Poly modifier of 3ds Max. When performing an outward extrusion, partial overlaps of the end results will merge/union with the geometry it overlaps into, while an inward extrude will subtract.