To convert a Bezier curve to a NURBS
            curve
         
         
            - Select the Bezier curve.
            
 
            -  
  + hold  
 .
               A marking menu appears.
               
             
            - Select Convert Bezier to NURBS.
               
Maya converts the Bezier
                  curve to a NURBS curve.
               
             
         
         To convert a NURBS curve
            to a Bezier curve, repeat the above procedure and select NURBS
               to Bezier.