How to port brush work into Milkshape 3D

While the new radiant is wonderful when working on non-urban maps, it can be a real pain if you (as me) are interested on street combat. This small tutorial will tell you how to port brush work from AA Radiant into Milkshape, so that you can then export it into the new Mohpa Radiant. My advice is, export every single building as a seperate model, do not export a complete map using this method.