lightmapping 1 model in different scenes

lets say i got scene 1

Scene 1 i got : 1 Road 1 Object on top of the road

( i lighmap it and all working good) i save scene as scene one then same it as scene 2 so i can stat from it)

Scene 2 i got 1 Road 2Objects on top of the road

( when i light map this scene and save it and go back to scene one i see shadows on the road fromt he second scene, how do i lighmap multiplescenes

Solved my bad i was creating lightmap on scene one then saving it as scene 2, so then when id lightmap scene 1 would overwrite scene one lightmap folder :)