From Objects

From Objects menu commands include items the below.

Project Project curves onto surfaces.
Pullback Pull curves onto surfaces.
Extract Edge Extract an edge of a surface.
Extract Border Duplicate the border of a surface.
Intersection Create curves at the intersection of surfaces.
Contour Create multiple contour curves through surfaces.
Section Create single section curves through surfaces.
Extract Isocurve Extract isocurves from a surface.
Extract Control Points Create point objects at the control point locations of curves.
Extract Wireframe Extract the wireframe of a surface.