VAV with Parallel Fan powered boxes

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I am trying to model VAV with Parallel Fan terminal units + Perimeter Slot diffusers with CHW System in Open Studio v2.6/E+8.9 and have a few questions-

1 Do I model it as Single Duct Parallel PIU Reheat? 2 or Using the HVAC template: ZoneVAV: Fan powered option in E+? I don't see that option in Open Studio? Which one should I use? 3 Is there a measure for this system? 4 How do I model Perimeter Slot diffusers?

Thanks Ranjani