The CMC designation can be used as recognition towards the Canada-United States-Mexico Agreement (CUSMA) requirements to work as a Management Consulting professional in the United States in prearranged business activities for U.S. or foreign employers.
"A Management Consultant provides services designed to improve the managerial, operating and economic performance of public and private entities by analyzing and resolving strategic and operating problems. Consultants may assist and advise in implementing recommendations but do not perform operational work for clients. Typically, a management consultant is an independent contractor or an employee of a consulting firm under contract to a client from a member country. The professional services provided must be temporary, periodical or on a fixed consulting basis rather than as full-time employment."
As a Canadian Citizen you will not have to apply for a TN Visa prior to arrival at a port of entry.
You may establish eligibility for TN classification at the time you seek admission to the United States by presenting required documentation to a U.S. Customs and Border Protection (CBP) officer at certain CBP-designated U.S. ports of entry or at a designated pre-clearance/pre-flight inspection station.
You must provide the following documentation to the CBP officer:
Proof of Canadian citizenship;
Letter from your prospective employer detailing items such as the professional capacity in which you will work in the United States, the purpose of your employment, your length of stay, and your educational qualifications; and
Credentials evaluation (Letter from CMC Canada), together with any applicable fees.
Please also see this article on the TN visa from Micheal Brennan which highlights some further details on history of the the prior NAFTA agreement and how holding the CMC designation is recognized as proof of education and experience in Management Consulting.