See DD02: Extrusion for explanations of New, Add, Remove, or Intersect
Duplicate PARTS/FEATURES in a straight line perpendicular to a plane or flat surface
Duplicate parts in a straight line perpendicular to a Plane or Flat Surface
Duplicate features in a straight line perpendicular to a Plane or Flat Surface
Duplicate parts about an Axis
Duplicate features about an Axis
Example: Duplicate a feature such as a gear tooth about a wheel.
Duplicate Parts along a curve
Duplicate Features along a curve.