Im unsure about this but am i right in thinking after you make your lod model you no longer need the other files for example
house.fbx
houselod1.fbx
houselod2.fbx
houselod3.fbx
Converted to
house.mesh
houselod1.mesh
houselod2.mesh
houselod3.mesh
Then created the house.mesh with the lods
am i right in saying after i do this i no longer need the .fbx files or the mesh files apart from the house.mesh