>>>>I want to have two DBCs that will have the same tables. What would be the fastest way to create that new DBC?
>>>
>>>Copy the folder.
>>
>>Oops forgot to mention one thing. The second DBC will have a different name.
>
>I guess it is safe to rename the database from a project.
>
>Probably you can also just rename the three files in Windows Explorer.

You should be able to rename in the project manager. But you cannot rename in the file explorer as the backlinks for the tables will not be correct to the database name.