Extruding a surface is equivalent to the Extrude Boss/Base operation from solid modeling. Allows you to extrude a surface from a sketch in two directions. However, a less known functionality of Surface Extrusion is the ability to create an extrusion on an existing surface from a wall. You can extrude a planar face when selected with ALT or a 3D face. For non-planar faces, remember the direction vector, which can....
