How to implement split systems in eQuest?

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I am just starting out in eQuest, I have watched some some courses online but the following issue has never came up. 1) How do you go about modeling 100% OA constant volume ventilation systems where some rooms have split-systems in them? 2) And to go even further what if some rooms additionally have hydraulic underfloor heating? Obviously you can not assign two air-side systems to one room. So what should I do?