How to make a custom object "chrome" or Transparent?!

[Mudbill]

One mesh can only have one lambert material. You can have multiple meshes in your model though. For instance, I have a wooden bed in my thread over here, where the wood is one material and the sheets is another. The textures are in two files.

You can do that by adding another object (mesh) to your model. Do NOT merge them into one though, or else you'll be forced to use a single texture file. Once you have two objects, hold right click and "Assign favorite material > lambert" to give it a new material instead of your existing one. Go to the channel box and assign your other texture to that. It's as simple as that, really. Just remember to keep the two objects separate or it won't work.