Use Connect Into - Duct/Pipe to automatically add a component to a system and create ductwork between the new component and the existing system.
For example, to add an air terminal to an existing system, place an air terminal in a view containing an existing duct system.
If the new component could be connected to more than one system, the Select Connector dialog opens.
The cursor is displayed with a plus sign.
The new component is added to the system.