How can i join multiple UV maps whitout combine the meshes? (if it's possible)

I know if i join the meshes and mess around with them a bit it’s possible. But the problem is that if i do this it ruins the smooth shading on them.

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You could look at https://wiki.blender.org/index.php/Extensions:2.6/Py/Scripts/UV/TextureAtlas

Why i cant Post i have question of this same problem