Use virtual meters when you need to aggregate or calculate data that is not possible using online meters. For example, if a space does not contain a main meter, you can create a virtual meter to collect data from different submeters and represent the missing main meter. Or, if you need to perform arithmetic calculations to obtain missing or incomplete data, you can create a virtual meter that calculates meter data with information from online meters. You can also add online points to a virtual meter. You can use custom units with virtual meters.