From the Form Individual Tax Return, select "Business" Tab and press the sub type "Net Income"

Scroll down to Motor Vehicle Expenses and select "ADD"

Fill Car Expense Details

Scroll down to "Calculation" and select" "S- Cents per kilometre" as theĀ  calculation method to use.

Then click "Back"

You can see that "Mazda" auto filled the "Motor Vehicle Expenses" schedule.

Click the little drop down and choose "S" (cents per kilometre method)