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).
Hello, please have a look in this comment for an example :https://ecosystem.atlassian.net/browse/JIM-421
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