To close a ticket as a duplicate of an existing ticket:
From a working ticket, click Close as Duplicate Ticket in the Ticket Summary panel.
The Close as Duplicate pop-up window is displayed.
Type the identification number of the duplicated ticket in the Duplicate Of box, and then click OK. The ticket status is changed to Closed(Closed as Duplicate) and the ticket ownership is released. The Ticket Details pane is redisplayed.
Note: You can reopen a ticket after it has been closed by clicking Reopen Ticket in the Next Steps panel.