You can easily copy a Jira issue template to adapt it for new use cases in Easy Templates for Jira app.
This option is available for users with the Administrator Permissions
Go to Manage Templates in the Admin Console
Find the template in the list and click on “…” 3-dot menu
Click “Copy, enter new Template’s name and click “Copy”
You’ll see a success message
Press “Edit” and you’ll be navigated to a newly created Template
You’re done! Edit your template and use it for a new Jira issue creation