Insert new curve to the mesh.

Select a NURBS mesh object. Click and drag over the NURBS mesh object on a View window to add and position both U and V directed curves. Release the mouse button to accept.

Add U directed curve Select a NURBS mesh object. Click and drag over the NURBS mesh object on a View window to add and position a U directed curve. Release the mouse button to accept.

Add V directed curve Select a NURBS mesh object. Click and drag over the NURBS mesh object on a View window to add and position a V directed curve. Release the mouse button to accept.