To use NURBS in Maya you can do one of the following:
         
            - Construct 3D models using NURBS primitives.
               Primitives are simple 3D objects created in the shape of common geometric forms such as cubes, spheres, cones, and so on.
                  Primitives can be a great starting point for many 3D shapes. You can modify the attributes of NURBS primitives to modify their
                  shape. You can also modify NURBS primitives by trimming away portions of their forms, beveling their edges, or by sculpting
                  them into different shapes using the Maya Artisan sculpting tools.
                
- Construct NURBS curves that define the basic outline of the 3D form you wish to construct and then use the curves as a basis
               for constructing your NURBS surfaces.
               Maya provides several options for constructing and modifying NURBS curves and surfaces:
                
                  - You can draw curves by placing control vertices, or edit points. The curve drawing tools are found in the  menu.
                  
- The features for editing NURBS curves are used by first selecting the Surfaces menu set, and then selecting the desired curve
                     editing feature from the  menu.
                  
- The features for creating NURBS surfaces are used by first selecting the Surfaces menu set, and then selecting the desired
                     surface creation feature from the  menu set.
                  
- The features for modifying NURBS surfaces are used by first selecting the Surfaces menu set, and then selecting the desired
                     surface editing feature from the  menu set.