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http://uml.netbeans.org/qa/nb65/SanityTests/UMLSanityTestSpecification.html#Element_References_Between_Multiple_UML 13 Delete an imported class from the class diagram 1. From the class diagram of UMLProj3, right click on "ClassC" 2. Select Delete from the context menu 3. Check the checkbox "Also remove from Imported Elements" on the Delete dialog Dialog has checkbox: "Also delete from model"