Moving entry to a subcollection and removing it from original collection?

I was used to drag entries from a collection to its subcollection and thereafter deleting it from the original collection with the entries remaining in the subcollection.
Now I tried again and when "Removing item from collection" I get the message that this deletes the entry also from the subcollection. How can I only remove it from the parent collection, but not the subcollection?
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