To Copy Curves or Edges
1. In the graphics window, select the curves or edges to copy.
2. Click Refine Model > Copy. The selected items are copied to the clipboard.
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You can also copy the items by pressing CTRL+C.
3. Click Refine Model > Paste. The copy curves tab opens.
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You can also paste the items by pressing CTRL+V.
4. By default, the curve type is set to Exact. To change the curve type to Approximate, right-click in the graphics window, and click Approximate from the shortcut menu. Alternatively, you can click Approximate from the Curve type list in the tab.
5. Click .
For more information, refer to the Part Modeling Help.