Create Curved Clipping Plane OR Clip from Geometry

Is it possible to Extrude a Crv made from a single direction Polyline (aka a rounded curve) and use that as a clipping plane? Like in the attached file (RH5) if i want to get an elevated look at the rounded stairs. Could the aqua-colored surface (made from extruding a curve) be turned into a clipping plane?

Clipping Plane from Extruded curve.3dm (1.6 MB)

EDIT: I did think of just cutting away each side of the Aqua surface and using the viewport Make 2D. That’s myh workaround for now, but still wondering if there’s a way to do it for real with a clipping plane as mentioned.


Nope… =)