When you open Sketcher in Part mode, you can use the edges of the part as references for sketching new entities. You can create offset entities from edges defined by lines, arcs, or splines. When you create an offset entity, each point of the original line, arc, or spline is first projected onto the sketching plane. Each point is then offset by the specified distance. The offset can be a positive or a negative value. When you offset model references an offset constraint is created, no constraint is created when you offset sketch references.

You can create offset entities from the following objects:

When you delete an offset or thickened edge, the corresponding reference entities are retained. If you do not use these references in the section, they are deleted when you exit Sketcher.