WordPress Term Duplicator with metadata allows you to copy or duplicate WordPress categories, tags, or taxonomy terms with all metadata.
Sometimes you need to duplicate a category or tag (or custom taxonomy term) in WordPress, and up until now there wasn’t really an easy way to do this. This plugin adds a “Duplicate” link in the actions under a term on its respective view.
That’s it. it works on multisite too. you can see that in demo here http://macmonir.com/td/wp-login.php