Is there a way to remove or hide an off sale or cancelled performance from reporting, without moving it out of the production season? Just something that says "don't count this one" toward seat capacities or sales numbers.
If you're looking to remove it from Analytics reports, you can filter using Performance Detail Status to exclude cancelled and off sale performances. You just need to make sure you've updated the status on the performance setup first. Not sure of any easy way to remove it from non-Analytics reports, though, so hopefully Analytics is all you need this for.