You can look up your industry code using the documents on the CRA website: https://www.statcan.gc.ca/eng/subjects/standard/naics/2017/index
Or you can use the search tools on the NAICS website: https://www.naics.com/search/
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.