By default, any model or package opens with a default diagram. You can create as many diagrams as you want in a model or in a package.
Select . If you have previously selected any object symbols, then the selected symbols will be copied into the new diagram (see also Creating a Diagram from a Selection).
Right-click the background of your diagram and select .
Right-click the model node in the Browser and select .
In each case you will be invited to specify a name, code, and optional comment for the new diagram.