The first thing you need to do to be able to move Topics between Folders, is to have a Folder already created!
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To move a Topic between folders click the Topic's name at the top of the page. Once the drop down menu opens, click "Manage My Topics". Once this page opens you can simply click on your Topic, or multiple Topics at once, and drag them between different folders. 

This is great for grouping Topics that relate to each other. You can also control who has access to a specific set of Topics based on which folders you give users that are a part of your team access to.