I would personally implore you to investigate JIRA Webhooks and JIRA REST API and handle it yourself. This is the Atlassian supported method currently. It's also worth noting that Copying an issue will Copy the sub-tasks also.
I am not aware of any add-on that provides this functionality within JIRA Cloud.
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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