I agree with
@YVR123.
You does not have to mention your previous sponsorship that you sponsored your spouse. It will be automatically calculated as you are going to show you are married and have a spouse.
on form 5768 Question 3 B) - You should not mention your previous sponsorship of your spouse. You have to mention your Spouse in Question 5. Alternatively if you want to mention your sponsorship of spouse - mention it in question 3 B) and write 0 in question 5. In short you will mention your spouse only at one place. Either 3 B) or 5.