Use connection string from different project when using Entity Model

Question

I have a application that uses Entity Framework. I have added some custom tables to the application's db and want to map those tables in a different project using EF model and the POCO entity generator template. My separate project needs to be reusable so I will not know the username/password for the connectionstring.

How can I use the username/password in the web.config but include only the metatdata in my app.config connectionstring?

Thanks.