I'm not quite sure what you are looking to achieve here.
I think you have a set of tasks with sub-tasks, so you want something like
And so-on. JIRA supports that with tasks and subtasks. But I don't understand what you want. Is it importing stuff? Something about the display? Etc?
I don't think its possible. There is only a single tier under Parent Tickets which are the Sub-Task Tickets. You will not be able to do a tree structure with that.
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