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Couple of thoughts:

• You could just add one or two MeterCustom trying to find relevant variables for chilled water use. It can be quite easy to do in some cases (eg few zones, or only central cooling in AirLoopHVAC), and quite awful in other situations (many different systems used, tons of zone).
• Usually your cooling coil will be embedded in something else, and therefore you have to choose if you take the system level variable or the coil variable. For eg, if you have an AirLoopHVAC with a central cooling coil, you'd use the Air loop's Air System Chilled Water Energy or the Coil's Cooling Coil Total Cooling Energy (or this
• I said one or two MeterCustom because I guess you'd ideally want to create two to make sure you're monitoring the same stuff on both side, but if you could live with a small approximation or if you're sure you're monitoring source side energy, then use a MeterCustom:Decrement
• Another way would be to create 3 plant Loops: one for the chiller, and one for each building. Between the chiller plant and buildings, you'd put a HeatExchanger:FluidToFluid. This allows you to clearly monitor the difference in consumption for each plant loop, and it is probably more similar to how things are in reality. But you'd have 3 loops, 3 pumps, etc, so a bit more complexity and simulation runtime.

Couple of thoughts:

• You could just add one or two MeterCustom trying to find relevant variables for chilled water use. It can be quite easy to do in some cases (eg few zones, or only central cooling in AirLoopHVAC), and quite awful in other situations (many different systems used, tons of zone).zones). The good news is that you can use scripting for this!
• Usually your cooling coil will be embedded in something else, and therefore you have to choose if you take the system level variable or the coil variable. For eg, if you have an AirLoopHVAC with a central cooling coil, you'd use the Air loop's Air System Chilled Water Energy or the Coil's Cooling Coil Total Cooling Energy (or this
• I said one or two MeterCustom because I guess you'd ideally want to create two to make sure you're monitoring the same stuff on both side, but if you could live with a small approximation or if you're sure you're monitoring source side energy, then use a MeterCustom:Decrement
• Another way would be to create 3 plant Loops: one for the chiller, and one for each building. Between the chiller plant and buildings, you'd put a HeatExchanger:FluidToFluid. This allows you to clearly monitor the difference in consumption for each plant loop, and it is probably more similar to how things are in reality. But you'd have 3 loops, 3 pumps, etc, so a bit more complexity and simulation runtime.