Merging 2 bodies in a part model

Hi,

I'm adding a large extrusion to a model, but because of the nature of the new section I need to make it some distance away from the existing body (otherwise extruded cuts on the new section would damage the existing body).  My plan is to do a "move body" when I'm finished creating the new section so that the 2 bodies will be touching.  Is there a way to merge those bodies so that they become one body?  Normally, I'd make an assembly of 2 separate parts, but I need the fillet feature.

Thanks,

Brian

SolidworksParts And Features