1. Select the Actions menu dropdown and then click on New Folder.
2. Enter a Folder name then click Save. By default the created folder will be Parent folder.
3. Select and right-click the folder you just created. Select New Folder.
4. Enter a name for this new sub-folder and click Save.
5. The Parent Folder will now display a + sign designating a sub-folder. Click the + sign to expand the view and display the sub-folders.