The problem arises for us when you make a joined part to representa system (which is very useful when dealing with extremely largeassemblies). It wold be very beneficial if along with specifyingmass and CG of the joined / simplified part we could: -

Problem1: "Ability to specify Moments of Inertia and CoordinateSystem for a part or assembly"

Problem2: "Ability to display and update mass propertiesparametrically in a separate Excel spreadsheet (similar to DesignTable and Feature Parameters)."

CalumSolidworksAssemblies