How to report to CRA if i have partially converted my primary residence to a rental unit

You don't need to enter this information in TurboTax, unless you are selling the property.

However, the CRA website says that I've to report deemed disposition of my property if I've  a change of use

https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/personal-income/[product key removed]al-gains/principal-residence-other-real-estate/changes-use.html

Then you can report it in the Sale of A Principal Residence section. This FAQ has instructions on how to get there: https://turbotax.community.intuit.ca/articles/1895231-how-do-i-report-the-sale-of-my-home-principal-residence