I think why Canadian mob doesn't create a commission?

Every family (Rizzuto,Musitano,The Siderno Group ecc) would had a seat and maybe if not a chairman an outside as primus Inter partes. And in Canada would be more easy for the bosses to meet without risk to be arrested.

The Ndrangheta in Ontario do have a commission of their own but if I understand right your speaking more about a National commission represented by each mafia families. Quebec has what they refer to as the round table. The round table is represented by leaders of the mafia families, Hells Angels, Irish and street gangs.
It could happen in the future depending how the war ends in Montreal.
You will need the Sicilians and Calabrians to sit down and start working together.

What I refer is a national commission like in the States.

If the sicilians and the calabrians would had a commission there would be no war and with the sicilians that are the losers I doubt the ndrangheta will not try to take all the rizzuto territory.

No need and the they are still Italians running the Mafia in Canada to a large extent. The Commission was an American thing. Plus the bad blood between the Sicilians and the Calabrians would make it impossible, at least in this era.