No, you can't, natively.
The structure plugin solves this rather well though. It's not precisely sub-task-of-a-subtask but it does the job (and in some ways, is better than the basic idea of nested sub-tasks anyway) - https://marketplace.atlassian.com/34717
The Jira Marketing team is putting together an ebook on migrating to Data Center. We're looking for pro tips on how you staffed your project team and organized your Proof of Concept. Share yo...
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