(Quoted from Graphics Pro. Full article here.)

Once images have been heavily corrected, they are typically a breeze to separate. Creating all the selections in an image to color correct can shorten separation development. Those same selections can often plug right in and create the channels that will end up as the final separations. Additionally, with the colors defined as being part of the same source hues, most methods like using the color range or channel menu to create separations can work a lot easier with far less chance of having extra colors in the final channels. Thus, it is a good idea to save selections made during the color correction process to be used later for separation purposes.

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