A Combined Highway Document combines a Highway Cargo Document (identified by a CCN) and a Highway Conveyance Document (identified by a CRN) into a single document for easier data entry. However, if you want to check the status of your Combined Highway Document, you need to check the statuses of the Highway Cargo Document and the Highway Conveyance Document separately since they are processed as separate Trade Documents. You can find more information about creating a Combined Highway Document in section 6.3.2 of the eManifest Portal User Guide at https://www.cbsa-asfc.gc.ca/prog/manif/portal-portail/guide-eng.html.