If the FindNoms Override dialog box cannot find a nominal point on the recent surface (see "Procedure 1: Finding Nominal Points on the Previous Surface"), it tries to find a nominal point from the priority surfaces. Priority surfaces are surfaces that the user has selected as a subset of CAD surfaces to find nominal points. Priority surfaces can be selected or deselected using the Set as Priority check box in the Edit CAD Elements dialog box (see the "Editing CAD" topic in the "Editing the CAD Display" section). If PC-DMIS finds an appropriate point among the priority surfaces, it selects the point and creates an Auto Vector Point based on the nominal values. It also displays the valid nominal points within the FindNoms tolerance of all the priority surfaces in the FindNoms Override dialog box.