How do I know if, on my t4a statement, line 48 is for business fees or professional fees?

For tax purposes, you should only select "Professional" if you were a Lawyer, Engineer, Notary, Veterinarian, Chartered or certified accountant, Physician, Bookkeeper, Surgeon, Architect, Chiropractor, or Psychologist. For other professions or businesses, you should select "Other Type of Business."

If you have TurboTax Live Assist & Review, here is how to talk to a Tax Expert: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/i-m-using-turbotax-live-assist-review-how-do-i-talk-to-a-tax-expert/00/873764