I have not been able to save layer 1 or higher as separate material shaders. Only Layer 0 gets saved. You need to re-create the Layer 1 shader as a layer 0 on some other geometry (like a primitive pp2), then manually create a layer 1 on the target material zone and then copy the shader over from the primitive pp2.

This is a very clumsy shortcoming of the existing material room.

Eternal Hobbyist