Cut made to parts in Assembly not showing up in parts files

Hello

I created a cut through three parts in an Assembly (Insert-->Assembly Feature-->Cut-->Extrude), which worked just fine. But I want those cuts to appear in the Part Files as well, when I go into the Part files the cut is not made. The cut needs to be there since I want to rapid prototype the parts.

Am I missing a step?

Thanks.

SolidworksAssemblies