Suppress only instances in config.?

Hello;

        This might be something simple, but this is my second professional sw dwg. I'm trying to work with configurations. I found how I can surpress an entire feature in one configuration over another, but can't seem to find how I can surpress just a few of the instances in a polar pattern of a rib. I would like one configuration to have 4 ribs, & another to have 8 ribs, both of the circular pattern of the eight, suppressing the 4. I would think there's a way to do this. If i click the configuration, but then go back into the part design tree, & surpress the 4 ribs, they're surpressed in both configs. Not finding it in the help, & left my books home.

           Thks, for any help;

                   rob_d (SW 2009 sp4)

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