Open up the material editor and go to the object/Material you want to have the reflection. On the Reflection, click the plug and go to Lighting:Ray Trace:Reflection (I belive that's it, I don't have it open, close enough for government work though). That's pretty much it if you want a simple one. RuntimeDNA, the Forums here, and DAZ I think has tutorials on how to do it. Oh, and don't forget to turn Shadow Catcher off in the materials tab for the item, plus you have to do a Ray Tracing @ the higher rendering (render settings, Firefly tab, move the slider to the right)