Note: this feature is not available on Free or Basic Billetto price plan. Please upgrade to Advanced plan to use this feature.
Campaigns created on account level can be enabled across events. All account level campaigns can be found on event level under the section "Inherited". You can start and stop account level campaigns as much as you like, but these cannot be edited once started on account level. You will have to start the campaign on account level to make it visible on event level.