Besides using rollouts at the NURBS object level, you can use the NURBS toolbox to create sub-objects.
Toolbox for NURBS objects
The toolbox contains buttons for creating NURBS sub-objects. In general, the toolbox behaves like this:
Other NURBS rollouts aren't displayed while you create the new sub-object. This differs from using the NURBS object's Create rollouts or the NURBS right-click menu.
The individual creation buttons are described in these topics: