Ah, yes it does. So obvious and I didn't even check. Thank you so much!
I'd like to just create a parametric poly surface from a closed spline, like a plane. The equivalent of Extrude but with no extrusion, just a single cap. Is this possible? I know I can create an Extrude Object for my spline, but then I have to manually Make Editable and delete the extrusion polys to leave the cap. Is there a way to keep this parametric? n.b. I'm an ex-Maya user, it was called Planar or Planar Trim in Maya, in the Surfaces section