When I create my assemblies I highlight the assembly and change all parts in that assembly to the same layer, This includes members, plates, welds, bolts & anchors. So for example when I turn of the beam layer everything associated with that layer turns of. It took a while to get used to this method but now I find I can get around a busy model with a lot less clutter. Before I did this when I turned of the beam layer I was left with the plates, bolts & welds just sitting in mid air and it was hard to know what belongs top what.
I would like to see a quicker way of grouping these components into a layer