We typically use beam sytems with members "Structural Usage" set to "Joist". This allows girders to be filtered from joists. Someone in our office changed a bunch of joists to girders within the beam systems. Now when I select by crossing or "select all instances" and filter out everything but girders the element properties has grayed out all of the beam elevation properties. This is happening because the "girders" within the beam systems are pinned to the beam system. How can I change all members within all beam systems structural usage to Joist?