Curve From Objects >
The DupBorder command creates a curve or polyline that duplicates the border of an open surface, polysurface, hatch, or mesh.
Specifies the layer for the results of the command.
Places the results on the current layer.
Places the results on the same layer as the input curve.
Note: If the input object is in a model that is attached using Worksession, the object will be placed on the current layer.
Places the results on the same layer as the target surface.
Create curves from other objects