Command entry: 
Modify panel

Select a NURBS surface sub-object.

Surface sub-object level

Material Properties rollout

Texture Channels group box

Turn on Gen. Mapping Coords.

Texture Surface group box

Choose User-Defined.

Edit Texture Surface button

Edit Texture Surface dialog

Rebuild button
This dialog rebuilds the texture surface and lets you change the number of CV rows or columns.
Interface
- Number in U
-
Sets the number of CV columns.
- Number in V
-
Sets the number of CV rows.