You can add a child diagram to a Business Object Model, to allow you to reuse part of a parent diagram, and focus on that part of the diagram.
Procedure
From the Diagrams folder under the Business Object Model file in Project Explorer, select
Add Child
> Diagram.
You can also make this selection from the Business Objects folder (New
> Other
> Other
> Diagram, and you will then be asked which Business Object Model to use), or from the .bom file:
New
> Diagram
or New
> Other
> Other
> Diagram.
From the New Business Object Model Diagram wizard, name the child diagram, and select the elements of the Business Object Model which you want to include in your new diagram.
Note: The elements you can include in your diagram are Class, Primitive Type and Enumeration.
Packages are not available for you to include.
Click
Finish. Using the elements selected above, your child diagram looks like this: