I use the handy Database Diagramming tool in SQL Server 2008 for creating and managing relationships. I have exported the sourceDB to the destinationDB but the diagram does
There's a tool for exporting the diagrams to file and back into a database that you can find here: https://github.com/timabell/database-diagram-scm/
You'd be able to use this by pointing it at your original database and doing an export, and then pointing at your target database and doing an import.