I found the following: https://answers.atlassian.com/questions/32187
... that states you have to import the subtasks with the parent tickets, but this is really old. I am hoping it is now possible to import a CSV of subtasks and enter the JIRA key of the parent tickets (or something similar).
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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