If you have placements that are in Arranged status and you don't expect them to start as planned, we highly recommend moving the placement back to Pending or On Hold status for you to later assess. This will stop them automatically changing status to "In Progress" when the original start date arrives.
If you don't believe the placement will rescheduled, move them to Cancelled status.
Bulk Updating Placement Status Levels
If your placements are in a group (most likely) you can use the tools available within the group to update multiple placements status levels at once.
See Article: Bulk Updating Placement Status Levels