If When you clone an issue in Jira Cloud with using Epic Clone, a dialog will be displayed where you can make your configuration for pop up allowing you to configure the cloned issue and its child issues. On this page it is explained where to find Epic Clone in This guide highlights the location of Epic Clone within a Jira issue. Let's assume we want to clone consider cloning this issue with using Epic Clone:
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It contains includes 3 child issues and 2 linked issues. Child Issue 2 contains has 3 sub-tasks. If you now select By clicking on the three dots → Clone with child issues, you will get can open the clone configuration dialog.
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Please proceed on this page where it is explained what you can do when cloning an issue with Epic Clone.