How to move subscriptions and containers in tree hierarchy
By default, you can drag-and-drop items in your subscriptions tree hierarchy to move a folder from one place to another. Here is another way to do the same job:
Select 'Move' menu option, which will open a dialog to select that folder
Then select the folder you like to move that folder under
Click on 'OK' button to finish the process
Additional Notes
If you like to move one folder or subscription to the topest level, which can also be called root level, use 'Move Dialog' and select none of the folders to move under.