Very much related to my another suggestion how to prevent the duplicates (https://community.atechmedia.com/topic/299-new-ticket-could-show-possible-existing-duplicate-tickets/), there could be a shortcut that we could use to mark tickets as duplicates of each other. This could be very much similar how Github works.
"Mark as duplicate" action would
Set the new ticket status to "Duplicate" (or Closed, this could be configured in the project settings)
Add an update to the duplicate ticket, "Duplicate of (old ticket)"
Add an update to the old ticket "(old ticket) is marked as duplicate of this ticket" - however this should not raise notifications in the old ticket at all.
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