“Duplicate of” is a status specific trigger. This is to cater multiple team dependency scenarios. Whenever an item is changed to a particular status then user wants to get an option to duplicate such item in another project. For example,
If you have 2 teams: development and migration team. The organization is migrating from legacy system to a new system that development team is working on.
Migration team tests that all crucial legacy data is copied and used in new system. Now, if Migration team finds an issue for development team but wanted to keep track it on their end as well.
To handle this, Migration team can make a custom status as: “Development Issue” and turn on its “Duplicate of” setting. Whenever an issue is changed to “Development Issue”, a popup will open to mention, where you want to create this duplicate.