Top-down Assemblies w/ Layout Sketches

Through trial and error, I am slowly figuring out what Ithink is the best strategy for using layout sketches in multi-levelassemblies. I can't find anything from Solidworks that talks aboutmethods. Does anyone know of any guides for this? Or, if its notasking too much, does anyone happen to have a relatively simplemulti-level assembly that displays good use of layoutsketches?SolidworksAssemblies