Offset
Use the Offset tool to create parallel lines, curves, or polylines at a specified distance from an existing object.
To offset an entity:
- Click on the Offset tool from the toolbar. 
- Enter a value for Count in the sidebar. Default is 1. 
- Select the entity to offset. Supported entities include Arc, Circle, Line, Polyline, Polygon, Rectangle. 
- Press Tab to set distance value for the selected entity. (Optional) 
- Move your mouse cursor in the direction that the offset entity should be created. A preview will appear. 
- Click to confirm the offset entity(s). 
- Press Esc or close the tool by clicking on the x in the sidebar, or open another tool. 
