A position adjustable support assembly is convertible from a tool case, to a step stool. A segmented position adjustable support assembly has a center 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 retained in base and top-receivers of a tool case. Retainers may secure the segmented assembly to the base and top. The top may convert to a top-step and the base may be utilized as a bottom step of a stepstool. A pair of legs may extend from the re-positioned top cover and these legs may be retained by a top-step retainer assembly that may be coupled to the base; thereby providing stability for the stepstool.