When you run transformation, it creates a temporary model and compares this model to the target model that you specify in the transformation configuration. The differences between the two models are displayed in the Merge window.
For more information about running transformations and specifying merge strategies, see the related topics below.
To apply the transformation configuration that invokes the Generalize_Classes transformation:
You can now explore the transformation output in the TargetModel model. The image below shows the visual representation of the elements in the generated SourceModelTgtModel output model. This model contains a package called BusinessClasses, which contains a class called Employee and an interface called IEmployee.

Related information:
Adding merge support for models generated by model-to-model transformation mapping projects