You can add lines to an existing purchase order for each item, material, service, or tool to be purchased.
The first time that you create an item or a service in the Item Master application, you can specify the percentage of items or services that can be received over the amount that is ordered in the initial agreement. The percentage value is applied to the organization level and to the vendor level for an item or a service.
When you add lines to a purchase order, you can modify the percentage of items or services that can be received over the amount that is ordered in the initial agreement. You can also choose to specify either a quantity or an amount, instead of a percentage.