If main taks A-1 and B-1 bellong to different project, then when A-1 is converted to subtask of B-1 it can´t mantain same identifier (because A and B are the project keys)
But if your question targets to mantain the "trasability", keep in mind that though A-1 once converted is not A-1 any more, it doesn't loose the reference, I mean, if you look for A-1 you´ll find it, no matter it actual identifier now was B-x
Yes and no.
If your two issues are in the same project, then converting XYZ-123 to be a sub-task of XYZ-456 will work fine, and it will retain the key of XYZ-123.
If you are moving it across projects though, then no, it will need to take on the project key of the new project and get a new number. You'll still be able to find it by searching for the old key.
Also, bear in mind that if XYZ-123 has its own sub-tasks, you'll need to decide what to do with them - they'll need to be moved to another parent, converted to be parent-level issues, or even deleted (ugh).
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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