Sometimes you want multiple lists of the same items, ranked by different criteria. For example, the question of who is the best baseball player, and who is your favorite baseball player may have two different answers.
You can reuse items from existing lists for new lists by going to the Make a List page for a specific list, turning on Advanced Controls, and clicking “Add Ranking Style”.

There you can easily specify your new criteria, and select any lists from your existing tree to clone into this new style. Note that after this operation, the new style lists will be managed separately from the lists that you cloned from. The only shared connection is the item management. Any changes to the items will be reflected in cloned lists and original lists.