You could parent all the created objects to a single object (e.g., WorldRoot at 0,0,0), then just drag that one object over. You can then edit that prefab as necessary (e.g., add CombineMeshes, tweak positions, set layers etc.). Unity already has a powerful scene/property editor, so it might be better to use that instead of building an alternate pipeline around text files... But I don't know exactly what you're trying to do either...