To
            copy UVs from one existing UV set to another
         
         
            - In the UV Texture Editor,
               select the UVs you want to copy.
            
 
            - In the UV Texture Editor,
               open the Polygons > Copy UVs to UV Set sub-menu
               and choose a UV set.
            
 
         
         Notes
            
            
               - When polygon UV sets are copied with
                  history, the source UV set is linked with the destination. Any changes
                  made to the source UV set by using construction history, will influence
                  the copied UV set. To avoid this issue, delete construction history
                  after copying the UV set.