Quad Menu for NURBS Objects

While a NURBS object is selected and the Modify panel is active, the quad menu displays two quadrants that are specifically for NURBS editing.

Quad menu for modifying NURBS models

Tools 1 (upper-left) Quadrant

These options are general display and sub-object level shortcuts.

Transform Degrade: Toggles Degradation Override.
Display Shaded Lattice, Display Lattices, Display Surfaces, and Display Curves: See Display Controls for NURBS Models.
Sub-objects: Displays the sub-object choices for the selected object, as well as a Top-level choice.

Tools 2 (lower-left) Quadrant

These options are creation and editing shortcuts.

Create CV Surface, Create CV Curve, Create Point Surface, Create Point Curve: These create a new NURBS sub-object.
Insert CV Row, Insert CV Column, Refine CV Curve, Refine CV Row: These add CVs to a CV Surface sub-object by inserting or refining. For the difference between inserting and refining, see Editing Surface CV Sub-Objects. See NURBS Concepts for more information about refining.