Basically, in photoshop, you select the parts you want to remain colored, reverse the selection, make a hue/sat adjustment layer, and desaturate everything in the reversed selection. That's the most straightforward workflow. It is legal in advanced but not in basic.
In basic you can make a hue/sat adjustment layer for the whole image and desat entire ranges of color. So if you shoot a yellow flower against a blue sky you can desat blue/cyan and get a yellow flower against grey sky. This approach is legal in basic. Obviously how well it works depends on how "isolated" the subject's color is from the rest of the image.
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