To extend a Modelica model or diagram, first select a base class to extend from when creating definitions. Use the Add Model dialog box to browse for and select a base class in the package browser. After you select a base class, the system generates a base class diagram and adds it to the new definition’s diagram. Note that:

• You cannot move or delete base class objects, but you can modify parameterization.
• You can add more objects to this diagram and connect them with base class objects.
• You cannot copy or paste base class objects.
• You can find and modify top-level parameters for a base class object in a variables and declarations dialog box.