Can we change just one form of payment which is US to CAD and leave the

Can we change just one form of payment which is US to CAD and leave the rest to US dollars?

I would like to inform you that only one currency can be used in a payment integration. So if you select CAD as form of payment, all the products in that payment form will have CAD as their payment.

A possible workaround would be to create a Multiple Payment form so that you can have one payment integration with CAD as the form of payment, and another payment integration with USD as the form of payment. Here's a guide that can help: How to Create a Basic Multiple Payment form.

Do let us know if you need further assistance.
Regards.