5/23/2017 -- The latest release of Fusion 360 has limited ways to manage designs within Fusion. There is no longer a way to "delete" a design, nor can one move a design to a pre-existing folder, there is no longer a way to create a new folder. Design management has been reduced to "Open", "Insert into current design", and "New drawing from design". This is very limited design management of existing and/or new designs.
Peter Boyer