Allocate units for hold orders

Trigger: An advertiser or media buyer submits a request to reserve specific advertising inventory or broadcast time slots pending final approval.

1. Receive inventory hold request from sales or media buyer
2. Check current availability of requested time slots or impressions
3. Apply priority rules and set hold expiration parameters
4. Reserve the requested units in the traffic management system
5. Send confirmation of the hold and expiration timeline to the requesting party

Outcome: The designated advertising units are blocked in the traffic system and held for the client until the hold expires or converts to a firm order.