I am trying to figure out how to add entities from the database to the existing Data Model that was reverse-engineered. I already created the data model but missed a could of entities, how can I add them without having to manually add them.
You can find it in Main Menu - Update Model from Database. In this case you will reverse all or part DB and it will merge to your model.
Object Explorer
Main Menu - File - Reverse Engineering - Connections. There select your connection to DB and clik on button Open Object Explorer. Now you are able by drag and drop from Object explorer to model add some new entities.