A position adjustable support assembiy is convertible to and from a tool case, to allow transport with a plurality of articles attached thereto, A segmented position adjustable support assembly has acenter assembly and a left and right assembly. The left and right assemblies are rotatable about the center assembly and the vertical supports of the center, left and right assemblies can be retainedin base and top-receivers of a tool case. Retainers may secure the segmented assembly to the base and top. This allows a user to mount the segmented assembly in a first work location, and then convertthe segmented assembly to a tool case for transport to a second work location.