Creates a copy of selected geometry, and positions it a specified distance from the original. 
Access
Ribbon:
Sketch tab
Modify panel
Offset
Applies two settings on the context menu:
- Loop Select
- By default, selects loops (curves joined at their endpoints). To select one or more curves individually, clear the check box, and then click curves.
- Constrain Offset
- By default, constrains the distance between the new geometry and the original to be equidistant. To remove the Equal constraint, clear the check mark. Reposition offset geometry with dimensions and constraints.
Specify an offset distance with the Dimension command.