NURBS > To CAD Phase converts a Shape object that has a NURBS surface into into a CAD object. This conversion is necessary to access the CAD-phase trimming functions.
Keep NURBS Model checkbox - specifies whether to keep the Shape object or delete the Shape object from the Model Manager.
Yes button - converts the object to a CAD object and terminates Shape phase.
No button - stops the conversion and stays in the Shape phase.