How to create like-official CD from list of packages

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Hi,
I am a big user of debian, I install on many machines at the university. Usually, I dowload the first CD, and packages we need, and I put in bulk all packages and generate the Packages.

Now I want to create local repsitory, like the official debian ,and generate like -official CD with my own packages. Where can I find the script or document to generate that. thanks a lot
regards
bela
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