You can delete domain modeling elements that you no longer
require either from a class diagram and the project or from only the
diagram.
About this task
If you delete domain modeling elements from a class diagram,
you remove the elements only from the visual representation in the
diagram; however, the elements remain in the project and are still
displayed in the
Project Explorer or
Project
Explorer view. If you delete elements from a project, you
permanently remove the domain modeling elements from both the diagram
and the project.
To delete a domain modeling element from a class
diagram or project: