Duplicate
Click the Home | Clipboard | Duplicate command or the 
button to duplicate the selected object or objects. Features, map layers, axes, and maps can be duplicated. Duplicate objects are placed immediately above the original objects in the Contents window. The original objects are deselected, and the duplicate objects are selected when the Duplicate command is clicked.
A linked object, for example a color scale, can only be duplicated if its parent object, for example the map, is also selected and duplicated.