Different map for Foliage

Hi everyone.

We have this parent map that is streaming several maps. One is a map with a landscape only, another one is the lighting map, another one is logic map, etc.
We are doing this, so, different level designers can work on different sub maps at the same time. So, we want to have a foliage map separated from the landscape (or any other surface) where the foliage is being painted on. However, we haven’t been able to find a way to do this because the foliage appears in the map where the surface where it is painted on is.
Is there a way to have the foliage actor in a different map from the surface (landscape, static meshes, etc) where it is painted on?

Please help!

Thanks