The template is composed of:
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One Epic issue,
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Any issues linked to the Epic (relation “Epic link”),
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Any sub-tasks in the Epic,
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Any sub-tasks in the issues linked to the Epic.
Example of Epic template looks like below:
To create issues linked to Epic you can use any issues type you have configured in your JIRA instance.
Issues in Epic can be a part of any JIRA projects crated in your JIRA instance.
How to create Epic and linked issues you can read on Atlassian Jira Epics Tutorial.
More about sub-tasks you can read here Atlassian support page.