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).
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
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