Taxes
Caletan works out sales tax for you, from where each of your locations is. There's nothing to set up.
From your location
Each location's rates come from its address: HST in Ontario, or GST and QST in Quebec. Its page shows them under Sales tax, and changing its address changes them. What you sell at a location is taxed at its rates, and a bill shows each rate on its own line.

Something with no location, such as a class without one, has no tax. A ticket is taxed where its show is, booking fee included.
What isn't taxed
Rooms for rent, equipment, services and party packages each have a Taxed switch, at the location's rates, for anything that isn't. An event has Charge tax in its More options.

A bill keeps the tax of the day it was issued, even if the rates change after.