This is how to transfer a key from one database to another:
|1.||Open a database and in the list window click the key tab (e.g. Openings).|
|2.||Switch to the database window and select a database (click it).|
|3.||Return to the key and right-click the key you want to transfer. Select Transfer in the menu that appears.|
The key (not the games it contains) will be copied to the other database and inserted at the end of the key that is present there.