Our Operational people use the ability in OML to highlight multiple events in OML browser, then can modify a CMA or other attribute to update all events to the same value.
IE we have a CMA called NOC notes. They may enter something like 05/15/19 15:00 Irwin did troubleshooting and found this server is under maintenance until 05/16/19 08:00. (This may not be best example how they use it). If they highlight 10 events, add that to the CMA, all 10 events are updated. They do not want to do 1 event at the same time with same info.