As of now, Analysis -> Mass Properties shows mass and CG data for the componenets / sub assemblies in the top assembly. Allow option to expand that to include all components in all sub assemblies as well. This would be a mass and CG report top to bottom of an entire assembly.
Currently you have to manually combine the report for each sub assembly and there is no easy way to get CG data for a component in a sub-assembly relative to a top assembly CYS. It would also be nice if this was available in a .cvs output option.