UVTex layer

There is UV Texture layer option in Blender. But where is the place to create new texture layers?

In the Object Data settings

i have a question in relation with this :

what the multiple uvtexture usefull for ?

can i use it in this situation :

  • one main uv texture that is linked to ground texture
  • another uv texture on top that is linked to a “decal” texture

i tried this but it work only in blender , when i export the model in another 3d file format (3ds,obj,… etc) for use with another 3d engine, the decal dosen’t appear

Thanks! One important use is that it is possible to use 2 different images for 2 sides.