Hi Sam,

I understand that to fabricate a physical truss, you have different solids, but to build a model to apply loads and calculate stress, you only need lines and cross sections if you are building a "beam" model of the truss.

If you want to draw the solids first, you can do that using the New Component method from my post above. Then you can use the automatic creation of beam cross sections that is in SpaceClaim. Using this method, it may happen that two beams don't touch at the ends due to the way the real parts weld on at the surface of another beam and not at the centerline where the lines would be drawn. You could use a Fixed Joint to connect the ends that have a gap between them.