Global Variables & Configurations

I have several global variables set (e.g. "Diameter" = 76mm, "Height" = 1500mm, etc) that I would like to change for different configurations of the part; however, I haven't figured out how to do that and I'm not sure if it is possible...a "global" variable seems like it should have one value that is shared over the entire model (i.e. all configurations).  Is this possible?

I have no problem changing non-global equations for different configurations, but I would rather not have to re-do my equations if I don't have to.

Thanks

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