Creates wireframe geometry from the edges of a 3D solid, surface, mesh, region, or subobject.
Access Methods
Button
Toolbar: Modeling tool set 
Solids - Edit tool group (expanded) Extract Edges Menu:
Modify
3D Operations
Extract Edges
Summary
With the XEDGES command, you can create wireframe geometry by extracting all the edges from the following objects:
- 3D solids
- 3D solid history subobjects
- Meshes
- Regions
- Surfaces
- Subobjects (edges and faces)
Press and hold Ctrl to select faces, edges and component objects, repeating if necessary. Objects such as lines, arcs, splines, or 3D polylines are created along the edges of the selected objects or subobjects.