This is how you organize your Topics in a folder directory.
To begin, click on the Topic's name at the top of the screen. Once the menu drops down, click "Manage My Topics". Once on this screen, there will be a button that says "Add Folder". Once you add a folder, you can drag and drop your topics in and out of the newly created folder.
You can also add new folders inside of folders by clicking on "Add Folder" next to the appropriate folder. There is no limit to how many folders you can add inside of folders.
Within this management screen you also are able to:
Folders are a great way to group your Topics using your own defined criteria!