To Copy Curves or Edges
1. In the graphics window, select the curves or edges to copy.
2. Click Model > Copy, or press CTRL+C. The selected items are copied to the clipboard.
3. Click Model > Paste, or press CTRL+V. The Copy tab opens.
4. By default, the curve type is set to Exact. To change the curve type to Approximate, in the Curve type list, select Approximate. Alternately, right-click the graphics window, and choose Approximate from the shortcut menu.
5. Click OK. The specified curve or edge is copied.