This means that a single EDMX file can now contain several diagrams that show different parts of your model displayed in a single EDMX file. A diagram is just a “representation” of the mapping defined in the EDMX file - previously you could only have one view on EDMX, now you can have several.
I do not have VS11 installed on my current machine, but as I recall, you should be able to select objects in your current diagram and move them to a new / different diagram. You should also be able to manage charts and switch between charts from the model browser.
source
share