A classifier that is connected to a parent by way of a generalization can redefine the ports of the parent.
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Open the property sheet of a class, interface, or component, and click the Ports tab.
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Click the Redefine button at the bottom of the tab to open the Parent Ports window, which will display a list of ports belonging to the parent classifier.
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Select a port and then click Redefine to have it redefined by the child classifier.
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Click Close to return to the child's property sheet. The redefined port will now appear in the list on the Ports tab.