How to reuse light maps across many levels in game?

I did wonder if there was a way to use a shader with a lightmap attribute and pick the baked maps up per object in the actual object prefabs. Then use these throughout multiple scenes. I have never tried this it is just an idea, one which may be totally wrong...

thanks for reply, i will try. i have tried a lot to solve this issue but could not find good way. i simply baked a cube with shadow in my scene. when i jumped to second scene using application.loadlevel(). lightmaps were gone. i have also applied don't destroyonload on my Cube object so that my cube object were not destroyed for second scene. but it doesn't work for lightmap.