parent = "KEY-123" will get you all subtasks of KEY-123.
If you want to search subtasks of all issues matching a criteria, you will need a plugin like JQL Tricks. You can then do something like
issue in parent("fixVersion = '1.1'")
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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