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?
Hello, Community! My name is Gosia and I'm a Product Manager on Jira Server and Data Center here at Atlassian. Since 2002 when we launched our public issue tracker, jira.atlass...
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