Hi to all !

I would like to ask something, do you guys know if there is an automated procedure to combine multiple textures meshes into one ?
I have made many using this procedure:

One texture file (UV Map) for each part of the model....

But then some people needed my models for a modification, and they need the texture map, to be in a single file ALL the textures of the model, i UVMapped the whole model, but it seems hard to do it by hand, match each aspect of the texture to the new UVMap...it will take ages !