It’s easy, only you need go to “Add-ons” and then to “Built-in Scripts–> Copy Project”
Then only fill the form to clone or copy the configuration of a source project.
Clone or Copy a JIRA Project configuration with Groovy ScriptRunner (With or without issues)
www.MrAddon.com ®: Jira & Confluence Administration Support Blog 
https://marketplace.atlassian.com/plugins/com.onresolve.jira.groovy.groovyrunner/server/overview
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Is it possible to get the groovy code of the clone project .
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I don’t know, but the code must be like this https://mraddon.blog/2015/12/18/tutorial-creating-a-project-template-with-standalone-artifacts-in-jira-7/
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