3ds Max Modeling :: UVW Texture Mapping With Multiple Textures?

I've unwrapped the uvs and am correcting the texture on a model. The model is essentially a building facade on a plane. The plane has a single large texture of the facade applied to it and that works fine. But I'd like to use another texture for a small area. I went to uvw unwrap> faces, and selected the area. Then I applied proj>planar map with x axis, turned off plane map and went into the UV editor and loaded up the new texture from "pick texture". The uv editor shows it fine. I make the adjustemnts and then leave the uv editor but it's not applying the nex texture in that area, instead it's applying thw whole facade to that small area.