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Start with the largest number that is less than 06720; mark that as function enabled; subtract that number from 6720 and find the next largest number you can subtract without the result being less than zero. All those "large" numbers represent what feature is currently enabled. Add them back up again and also whatever number represents the new feature you want add.
Effectively each coding number represents 1 bit of the coding value when written down as a binary number.
In your case you have 4096, 2048, 512, 64 coded right now.