From your post, it seems that you're trying to achieve some conditional formatting based on multiple conditions (Region and Revenue). If that's the case, take a look at this article which explains pretty well what you're trying to do. However, be aware of the potential issues you may have before going down this road.
What Pedro F posted is exactly what you look for.
I would just add it's maybe easier to maintain for you to add a new column in your criteria and calculate there a "flag" to be used in your conditional formatting rules, mainly if you aren't conformable with the idea of editing XML by hand (a bit of "Do as I say, not as I do" as Christian Berg often says)