If a livestock event has been removed in Trev and the event has already been synchronised with Figured, the original event will appear in the Manage Data screen (with an orange ! icon) for you to review. By re-syncing this event it will remove it from Figured as well as the Manage Data screen in Trev.
If the event was deleted before it was ever synchronised with Figured, it will simply be removed from the Manage Data screen.
Click here for more information on Sync Status.