Is there a way setup a certain customer account, if selected, Samba will not calculate tax? I know i can have a button to add tax remove tax from tickets. But i am looking for a way when a specific customer account is selected, it wont have tax calculated while the rest will still have tax calculated normally.
Yes you can use ticket entity changed event to trigger an action to remove tax if that entity is selected. That entity would be a custom constraint in the rule.