Using Network and DMX 1 & 2 as separate universes on Ion

I think I knew how to do this years ago before all the updates happened on the software for the Ion, but now I don't see how to do it.  Our Ion board has 6144 outputs.  Currently, it only has been running our Sensor3 dimmers off the network input.  Now, we are starting to introduce some DMX.  How do I set up the 2 DMX ports and the network to have 3 universes?  I have tried going under set up and into output, but I don't see how to configure the outputs.  It says Name (all being "console") ports (1-4), then addresses, RDM, doubled, and speed.  I can change the addresses, but I don't see how to configure what it what. Right now, DMX 1 is mirroring the network.

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