List the ways you can refine or modify a surface’s profile.

What will be an ideal response?

Surface profiles can be edited in several ways. You can change the directions of a surface in terms of its U and V isocurves and its normal direction. To alter the shape of a surface, you can translate its control points in U, V, and N directions; adjust the weighting of the control points; use handlebar editor; add/remove knot points; and add/remove control points. Furthermore, you can rebuild a surface by specifying the point counts and degree of polynomial in the U and V directions. To refine a surface without changing its degree of polynomial and control point count, you reparameterize it.