EA MDG names must have fewer than 13 characters. So if your Reference Model name has more than this, use this field to give your MDG a shorter name.
If you are changing your Reference Model, but need to maintain backward-compatibility, it’s OK to change the name of the Reference Model, but keep the MDG name the same. That way, existing elements in your model, which were created with old versions of the Reference Model, will still use newer versions.
ACTION: Save as MDG
Saves the current diagram type settings within this Reference Model into an MDG, so that each diagram will get a customized toolbox.