Create a collection from a subcollection

I have a subcollection that I want to change into a collection on my organizational tree. I have unsuccessfully tried to do this by dragging and dropping the subcollection onto the main tree trunk. The subcollection keeps going back to its place under its parent collection. Must I copy all the items in the subcollection into a new collection, and then delete the old subcollection, or will dragging and dropping work, if I do it the right way? If so, what is the correct way? Thanks.
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