Different HVAC system in baseline than proposed design- C&S

I am doing the energy model for a CS project. The baseline HVAC is a packaged rooftop (direct expansion) and the proposed design includes chillers and piping to each tenant space, but it doesn't include the fancoil units. If I model the tenant HVAC as having packaged rooftop (same as baseline), then it is not compatible with the chiller system. Also, the chiller would end cooling only a the building and thus the model won't reflect the benefits of having an efficient chiller. It is clear that tenants should include fancoils, but should I model them? Thank you.