On the Energy tab (or Water or Waste tabs) you can "Change Meter Selections" (find the link above the table that lists your meters). On this page (see below), you select which meters to include in your metrics, and whether those meters account for all of the property's energy (or water/waste).
Most properties will check the boxes for all their meters, and select the first option: These meters account for the total energy..."
Buildings with sub-meters and sometimes campuses will have different answers.
See this FAQ for information on how to select meters for campuses (parent properties).