Thank you so much for your reply.
Actually I have added CAD in the currency list.
However, when I add the client, the country of the client's billing address is preset to "Hong Kong" and cannot be changed to other country.
I finally managed to talked to my account manager for Hong Kong region and she confirmed that I cannot add a Canadian client from Hong Kong. What I could do is to set up another profile in Canada in order to serve my Canadian clients.
