You need three steps
Branch rule / related issues
This will work nice if the workflows in parents and subtasks are the same, otherwise, the thingcan be a little bit messy because you have to match every status in subtask with the corresponding status in parent.
Also, this works fine with only one subtask or in the case of transitioning from "open" to "in work" (the first subtask to go into work triggers the parent), but it will be more complicated for closing (is the last subtask the one that defines the parent is finished) but in this case jira has an option to close parent when all subtasks are done.
Hope this helps.
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