This question is in reference to Atlassian Documentation: Creating a Sub-Task of a Subtask
Can we create a Subtask of a subtask?
No. JIRA does not do sub-task of a sub-task
You could try the Portfolio add-on to get layers above/alongside Epics, or the Structure add-on which does something that makes it look like you have layers of sub-tasks.
JIRA is limited to 2 levels only, and the feature request of enabling arbitrary depth has been open for at least 10 years.
Structure is an add-on that allows you trees (forests) of issues, as a tool targeting exactly this problem.
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