Corners of a SubD surface

Just beginning with SubD and I need to interface SubD with NURBS, as in I’ll have a NURBS surface ending at a 3D curve which can have 90 degree or other angles in it. Creating a SubD surface will create rounded edges. I can create a NURBS surface to attach and QuadRemesh it but that may or may not create the required corners. Is there a way to manually create a corner on a SubD face?

While in flat mode you can select the corner and add a crease.

It works also in smooth mode but you will need to hit F10 first to see the control points, then select the corner and add a crease

Ah! That looks like what I’m after! Thanks.

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