I'm sorry, but I've never given any weight to the details because I've never served.You have to give it to him.
I put the weight on the business. the problem is that being a very big set now it takes a lot of time even to open the design of a washer. Maybe I have to fix something in the settings.you can do what you want but if you want the weights of the commercials to be considered you must assign or a weight or material. If you don't give him this information you won't have a proper weight of your set.
I also suggest you, to simplify your life:ciao.
- to import you commercials like parts and not like assemblies
- create a part template that already has a density or material assigned