I can't think of any downsides to creating multiple externalreferences to multiple parts. I have a frame that is 8 levels deepin my assembly and needs to be able to reference every one of thesesubassemblies and their different parts. Do rebuild times and filesizes get too big when having external references to multipleparts? Or is it the problem of these references not being able torebuild if a part is missing? Or is it just one of those "bestpractice" things?SolidworksParts And Features