Note, at this point you can’t edit nurbs controls anymore because the object is now multiple surfaces stitched together to form a solid. You can still edit the object using the following steps:
Select Derive Face tool and click on original face of nurbs solid.
Select Convert to Nurbs tool and click on the derived face.
Edit Controls to change shape.
Note, use Nurbs Reconstruct tool to increase or decrease controls if desired.
Thicken modified surface to convert back into a solid.
