IMHO filters are a sloppy way to detail on a regular basis. They can be good for a one off if it would save you a heap of time but you are better to model with your detail in mind. Why can't you just detail your FG assembly, not your main assembly, you wouldn't have to filter anything? If you are really determined to use filters then set up a ViewRep with just the parts you want in your detail, then filter with ViewRep. Is there any reason why you want to use filters?
Regards,
Stew
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Stew, AICP
Inventor Professional 2013, Autodesk Simulation Multiphysics 2013
Windows 7 x64 Core i7 32GB Ram FX2000