Currently, there is no way to clone packages in Lightning, though this existed in Salesforce Classic. This would be incredibly helpful.
See more in this community topic:
https://community.nintex.com/docgen-for-salesforce-7/clone-package-in-salesforce-lightning-24455
Hi there, So we've just added cloning document packages in lightning at the end of last year (18.12), update your package and let us now what you think?
https://help.nintex.com/en-US/platform/ReleaseNotes/DocGen/NintexDrawloop.htm