C - Commands  
COPYBASE (command)
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It copies objects in the clipboard with a specified base point

  Menu:  Edit Copy with base point

Specify base point:

Select objects:

The selected objects are copied to the Clipboard. Use PASTECLIP to move the copied objects from the Clipboard to a location in the same document or to another document. When pasting an object copied with COPYBASEthe object is placed according to the specified base point.