How to associate automation with MTM test case in Test Studio?

I've searched all over and I can't seem to find this basic functionality.  Where/how do I associate an automated test I created in Test Studio with a manual test that is already written in Microsoft Test Manager (MTM)?  I have existing CodedUI automation that runs on a nightly basis through TFS and I want to include the new TS automation in this same build.

Thanks,
Nick