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.
Teams break work down in order to help simplify complex tasks. This is often done iteratively, with tasks being broken down into smaller tasks and so on until the work is accurately captured in well-...
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