Multiple NAICS assigned to a contract

I have been asked if a fixed priced construction Job Order Contract have more than one Construction NAICS Code assigned to it.  I have searched through the regulations and have not found where it directs it cannot be done so I am working on the presumption of asking forgiveness rather than for permission for right now during the research phase.  I would like any positive feedback and guidance with this subject hopefully someone out there has seen or knows of it being done.  Thanks.