Mesh Materials

[Anonymous]

I just modelled some terrain using the mesh tool and I was wanting to know if it's possible to use different materials on the mesh; eg. the mesh is grass but an area defined on the plan needs to be dirt. I'm completely stuck for ideas as I am new to using the mesh tool. Any help on this would be much appreciated.

[Anonymous]

Thank you, FMR and Peter. subtract work much better than what I did before.