The work area (user interface) > Workplanes > Copy a workplane
  
Copy a workplane
You can copy workplanes to use in multiple operations. The workplane is copied along with any 2D geometry on the workplane (construction or profile geometry).
To copy a workplane,
1. Click Structure and then, in the Workplane group, click Copy. The Create Copy dialog box opens.
2. Select the Source workplane in the Structure Browser.
3. Type a Name for the new workplane.
4. Click Model Name and type a name. Model Name is the contents file name for the element when you save 3D Data files.
5. Select the Owner (a workplane set or assembly) in the Structure Browser.
6. Select a method to position the workplane. See Position a workplane.
7. Click OK to complete the operation.