Suppose you have your-package.deb file and want to change files inside the package:

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mkdir -p tmp/DEBIAN
dpkg-deb -x your-package.deb tmp/
dpkg-deb --control your-package.deb tmp/DEBIAN

Modify the file tmp/DEBIAN/control as you like it.

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dpkg-deb -b tmp your-package-custom.deb

Finally,

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dpkg -i your-package-custom.deb

Done!!!