can i have 4 level hierarchy in JIRA i.e., on top epic any issuetype can work.
Please help me if any other option can work
Natively, no. It's Epic -> Story -> Sub-task.
But Advanced Roadmaps (Portfolio) adds initiatives and themes, Structure can make issue types behave though there were a richer hierarchy, and if you're really into Agile and quite a large organisation, Jira Align may be worth a look (although it doesn't add to Jira, taking the higher layers out into itself)
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If there were another way to do it without Apps, I would have mentioned it, no matter how weak. Without apps, the best you can do it get all your users to imagine it all and not do it in Jira.
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