You select Tools - Add Component - Ports Only in order to insert internal ports in your circuit which may be used later in a circuit design program. An assistant appears on your display which helps you set up your component. This dialog box is also opened when you select the command Object - Component Properties
Using Variables in this dialog box
All of the ports associated with this component will have a common ground and are simultaneously de-embedded during the electromagnetic analysis. This component type is functionally equivalent to using
Number of Ports: Enter the desired number of ports for your component here. You may use an unlimited number of ports.
Note that you may set reference planes and terminal widths for the component terminals by selecting the Component ports and selecting Object - Port Properties.
For a detailed discussion of Components, please refer to the Components chapter in the Sonnet User's Guide.