How to select the Order Type in Order Lines

Hi,

We have New Requirement, Any one help to achieve this Requirement.

Requirement

1. User wants to select the Order Type in Line Item for Item Wise

2. User Book the sales order for more then one Item, We have created the Order types for Item wise, So they want to select the Order Type in Line Item for Item Wise.

How to Achieve this?

Thanks in Advance

Mohan