To help you organize your songs, videos, and other items, you can create folders, then add playlists and other folders to them. (You can’t add individual songs or videos directly to a folder.)
Create a folder: Choose File > New > Playlist Folder, then type a name for the folder and press Return.
Add items to a folder: Drag playlists or other folders into the folder.
Move a folder out of another folder: Drag it toward the left edge of the iTunes window.
Rename a folder: Double-click it and type the new name.