Open the UML model diagram file for the system that includes the model you want to delete.
On the UML menu, click Models.
In the UML Models dialog box, select the model you want to delete, click Delete, and then click OK.
In the UML Model Diagram, a system must contain at least one model. Therefore, you can't delete the last model in a system.
Tip: You can also delete a model by right-clicking the model's icon in the tree view, and then clicking Delete.