I currently have two individual bodies and two parts. The girder and deck are individual bodies and the longitudinal reo and shear ligs are parts in their own right (each part contains more than one line body). I just tried combining all of the reo and girder into a single part file but I am getting an error to do with the shared topology which I have set to default. The shear ligs extend into the deck but I do not wish to combine the deck with the rest of the bodies into a part as I want to apply a frictional factor to that interface.