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If you are modeling inheritance and you don't already have your subentities modeled, then you may probably want to use entity modeler's subclass widget. To use it, just select the entity you want to subclass and click the subclass button in the toolbar. 

Manual Inheritance Modeling

Horizontal Inheritance

By far the easiest form of inheritance to model is Horizontal Inheritance. If you've already modeled a subentity, just select the entity then in the properties panel, select a parent entity and you're done. Yes, it really is that easy. When you save your model, Entity Modeler warns that you forgot to copy parent relationships and attributes to your new child entity. Then it kindly does the job for you.