This tool lets you select components in a view to be added to a system.
System Tools panel
Edit System (Piping System When more than one system is associated with the selected component, the Select a System dialog opens.
All except the components in the selected system are dimmed in the view, and the System Editor toolbar displays. The Options Bar displays the System Name, System Equipment and the Number of Elements in the system.
Edit Duct/Pipe System panel
The Add to System tool will only let you select components that are compatible with the selected system. For example, you cannot add an exhaust diffuser to a supply system, or a toilet to a closed-loop heating system.
The selected components are added to the system.