How to reserve orders automatically which unreserved manually.

We enable the auto scheduling functionality for sales order, which reserve the inventory for items in sales order.

Based on business decision, sometimes user need to unreserve the old orders and make quantity available to new orders.

We like to reserve such orders again by system once receipt happen.

How can we achive this without manual intervenion..

in short is ther any current program which run every night, and reserve  items in orders for which receipt happens and inventory available.

Need guidacne..