How to remove from a collection all the items contained in other collection?

Is there some quick way to remove from a collections all the items contained in other collection? I do not want to do it for every single item individually, sice they are a lot.

Thanks!
  • I think you can build some advanced searches that are like "is in collection A, but not in collection B".
  • Yes, but then, you are in the advanced search collection, like I can be in the collection A, but I want to remove all those items from collection B. How to do it?
  • Assign a colored tag to all items found in the search,.g to group A, filter by that tag,. select all, remove from group.
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