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Applying Mass Properties to an Assembly / Creating a composite part from an assembly

Hi all, from what I understand, it's not possible to override the mass properties of a full assembly. Is this true?
If true, I assume the next best option would be to create a composite part from this assembly and apply mass properties to that. Is it possible to create a composite part from an assembly? This is an imported part from someone else's design (which was originally imported into Solidworks). Each piece of this 50-60 part assembly is in its own part studio as an result of the Solidworks import.
Comments
Right click the assembly tab, then open the properties. There should be an override option.
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Thanks — I am able to do mass, but unfortunately not center of mass as it still wants materials defined (which I don't have).
I guess you could select the composite option when importing the parts. If that doesn't work, you can manually composite all of the parts with an in-context studio.
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