When it is necessary to create a copy of a project and keep it within the same database, select the top right menu and choose Copy to same db.
This creates a complete copy of the project, including all rooms and functions, in the same database. Useful, e.g., for exploring different options/alternatives. Since the room function number can't be duplicated in a database, it is useful to give the room a prefix so it keeps the room's serial number; otherwise, it will use the next one.