Display Inherited Operations
You can configure a selected element in a diagram to display the complete operation set obtained from all ancestors in the element's type hierarchy, as well as those directly owned.
Right-click element on diagram | Compartment Visibility
On the 'Compartment Visibility' dialog, in the 'Show Element Compartments' panel, select the 'Inherited Operations' checkbox.
This diagram illustrates the behavior, where it has been enabled for each element in a simple hierarchy. The Child element inherits from all other levels of the hierarchy.