Hi @CaptPete. You can achieve this by using the Platform Categories filter. In LaunchBox, use the filter dropdown and make sure you are on Platform Categories.
Then, right click an item in your list on the left side, choose Add > Category. Categories can contain metadata and media which will be used in Big Box when navigating through your Platform Categories filter. Use the Parents tab to position where you want it shown in your hierarchy.
Then you can right click > Edit any of your platforms, go to their Parents Tab and position them where you want.