How do I join a predefined tab to a sheet metal design.

I'm using SW 2010 Premium. I would like to design standard features such as specialized tabs, etc as their own parts then assemble them on a sheet metal base structure so that they properly align with their mating features.  This will require some sort of merge function which will 'join' the part with the underlying sheetmetal base to form an unfoldable whole.  Can someone point me at how this might be done?

SolidworksSheet Metal