Do I enter each Medical Expense separately or group by class such as prescriptions?

Hello,

You can enter your medical receipts in groups such as entering all your prescriptions together, all of your dental, and so on. 

https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/medical-tax-credits-deductions/enter-medical-expenses/L3eIlNS9Y_CA_en_CA

Hope this helps!