There is no built-in feature in Jira to directly clone a child work item within an Epic. However, you can achieve this by navigating to the Issue Navigator and using the JQL query: parentEpic = <epic-key>. From there, you can clone any of the child work items by clicking the three-dot menu next to the issue.
If this isn’t what you were asking, I agree with @John Funk . It would be helpful to provide more details in your question.
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