Level Design with Modo

i have separate objects like chair, table. i added these objects to my project as "File/Import Reference". in that case unity import this scene(.lxo) as one game object with different meshes(table,chair). i have table and chair object in the same folder. i want to keep scene design in modo because i want to render it also in Modo.

is there any way to import reference objects to unity as external files?