How to sub-meter two buildings with same central plant?

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Dear all,

I'm modelling a project with two buildings served by the same central cooling plant. Building A is a commercial building, while Building B is commercial + office(with different setpoint & schedule). My problem now is how to analyze the consumption of individual building easily, regarding two aspects below:

1. For zone-wise consumption such as lighting and interior equipment, is there any way to sub-meter individual building without defining complicated zonelists (such as A_liftlobby_commercial, B_toilet_office, etc.)?

2. For central HVAC consumption such as chiller, pump and cooling tower, my current approach is to post-process the result in excel. The logic is to distribute the central consumption to zones based on terminal cooling demand and then get individual building consumption by filtering the zone names. Can anyone kindly suggest smarter approach for such analysis?

Many thanks

Rocky