Hello.
I hope this helps with your query.
If the biblical text is in the Digital Bible Library (DBL), the best thing to do is to write to the organization that owns the rights to the text. They are the ones who uploaded it to the DBL. Ask them if they can add it as a Paratext resource. This is a process that is typically done by the Curator of the digital library of this organization. Once they have done this, you will be able to view the resource from Paratext-Download/Install Resources and install it on your computer.
If the text is not in the DBL or is based on a text in the DBL but has modifications, then I think you will not be able to do this, because to be uploaded to the DBL and placed as a resource it must be a completely finished and revised text. If this is your case, you can simply create a new project from the Paratext-New project menu. You can create a local project or create an auxiliary based on a registered project, in case you need to use the send/receive server.
Saludos,
Pepe.