You can select objects in your scene and export them to a new, referenced file using the Export Selection As Reference command. When you export objects as file references, Maya creates a new scene file in the specified location and references that file into the open parent scene.
You can also set options in the Export Selection Options window to export selected objects as referenced files.
When you use Export Selection As Reference, the resulting referenced objects maintain their worldspace position and do not need to be repositioned after being loaded into the parent scene.
You can export object selections as references from the Outliner Reference menu, .Reference Editor, or Maya main menu bar.
Export references from the Outliner
Maya creates a new scene file and references it into the current scene.
Export references from the Export Selection Options window
You can also set other referencing options, such as namespace or proxies options. See File Export All Export Selection.
Maya creates a new scene file and references it into the current scene.