You would use Form T2125. If you're using TurboTax Online you can access it by clicking on Income>Self-Employment> Self-Employment Profile in the left side menu. This is also the place that you would put your expenses or CCA. Remember to only put in your portion of the amounts and only the amounts related to business use.
If you need more assistance, please contact our phone support as they will be better able to assist you (*Not available for TurboTax Free users*). https://turbotax.community.intuit.ca/replies/3152013
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.