You can delete occurrences of connections. The graphical representation of the connection is deleted from the model, but the connection itself is retained and still exists, for example, between objects at the definition level. You can see this on the Relationships tab when you select one of the connected objects.
You can delete connections and relationships. The graphical representation of connections will be deleted, as well. If you delete the definitions, the connections and relationships no longer exist.
Procedure
Select an object whose connection to another object you deleted.