I'm working on a fairly large assembly.  It has some parts and some subassemblies within it.  I have assigned mass properties to each part and subassembly so that I can have a weight for the overall assembly.  The only problem is that when I'm in the overall assembly and click Tools-> Mass Properties it only shows the cumulative weight for the parts, it does not include the subassemblies.  Anybody know how to fix this?