Stevie Griffin is correct. "To duplicate a CMS item click on the collection item and scroll to the bottom. There is a duplicate button. https://forum.webflow.com/t/new-feature-one-click-collection-item-creation/26075 "

Nice information as usual. It looks great and helpful as well.

This exists. To duplicate a CMS item click on the collection item and scroll to the bottom. There is a duplicate button. https://forum.webflow.com/t/new-feature-one-click-collection-item-creation/26075

add a "check for duplicates" and/or "remove duplicates" button as well. 

Need to duplicate items or (at least) fill dummy content even when some items already exist to populate the collection and fast create kind of archive pages.