Once service type in place/tied to a ticket, analysts could manually cancel or delay the SLA events through UI (refer to below screen shot). There is no out of box based on the group to auto cancel the SLA events due to the new group without new Service Type in this situation. If the new group has own service type, it could replace the previous service type and corresponding SLA events depending on the setting in service type ranking. Also, consider the usage of options cr_sla and cr_allow_sla_downgrade. These factors can change how the application determines which service type and SLA events apply on the ticket.