By default, when running a Modeling Gateway export, the export starts at the Universe Topology container and exports all device models from the Universe down. This is controlled by the RootContainerToExport element in the Modeling Gateway $SPECROOT/SS-Tools/.modelinggatewayresource.xml file.
<RootContainerToExport model_type="Universe" model_name=""/>
By default, all topology and modeling information under the Universe container is exported. You can modify the RootContainerToExport element to specify a different root container from which to export. All the contents of the root container and each of its subcontainers are exported.