Extending a app with other app

Hello, i'm realtive new in django framework, and i can not find how to do the following thing:

Does anybody knows how to create a "app" inside a "app"? I have read that i must create an other settings and url file inside the first "app" but i don't look crear how ? 

Anyone knows some open source project that implement this to see the code? or some doc/tutorial/blog entry to read?

Thanks guys =)

Nicolas Ardison

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