From the Tools toolbar, select
the Pen tool 
.
Once you have created contours, you can easily duplicate them.
To duplicate a contour:
From the Tools toolbar, select
the Pen tool .
From the Tool Options palette,
select Edit Mode 
.
Select one or more nodes.
From Objects > Edit choose:
Duplicate (Ctrl+D) Copies the selected contour and pastes it directly on top of the original contour.
Note: The overlapping nodes will all show node-on-node indicators.
Duplicate & Offset (Ctrl+Shift+D) Copies the selected contour and pastes it at an offset from the original contour. The default offset is 10 pixels in the X and Y directions.
Note: To adjust the amount of offset, type new settings in the Duplication X and Duplication Y fields of the Tool Options palette (for the Pen Tool).
Adding or Removing Nodes on a Contour
Reversing the Direction of Contours or Paths