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This looks like a good use for the AirLoopHVAC:DedicatedOutdoorAirSystem object, which represents a central dedicated outdoor air system (DOAS) and delivers outdoor air to multiple AirLoopHVAC (central air) systems. You can specify the number and names of these AirLoopHVAC systems and use an AirLoopHVAC:Mixer object and AirLoopHVAC:Splitter object to define how air moves between the central DOAS and AirLoopHVAC systems. You need to reference these mixer/splitter objects in the central DOAS object, which isn't shown as input field entries in the Input Output Reference but it is visible in the example object (copied below, input fields 4-5).

AirLoopHVAC:DedicatedOutdoorAirSystem,
  AirLoopHVAC DOAS,        !- Name
  AirLoopDOAS OA system,   !- AirLoopHVAC:OutdoorAirSystem Name
  ALWAYS_ON,               !- Availability Schedule Name
  AirLoopDOASMixer,        !- AirLoopHVAC:Mixer Name
  AirLoopDOASSplitter,     !- AirLoopHVAC:Splitter Name
  4.5,                     !- Preheat Design Temperature {C}
  0.004,                   !- Preheat Design Humidity Ratio {kgWater/kgDryAir}
  17.5,                    !- Precool Design Temperature {C}
  0.012,                   !- Precool Design Humidity Ratio {kgWater/kgDryAir}
  5,                       !- Number of AirLoopHVAC
  PSZ-AC:1,                !- AirLoopHVAC 1 Name
  PSZ-AC:2,                !- AirLoopHVAC 2 Name
  PSZ-AC:3,                !- AirLoopHVAC 3 Name
  PSZ-AC:4,                !- AirLoopHVAC 4 Name
  PSZ-AC:5;                !- AirLoopHVAC 5 Name