Segmentation in Sales Documents 
Segmentation is available in sales and distribution (SD). Segmentation at the item level allows you to you to sell materials with different attributes, for example, quality of the material and its country of origin. To sell materials with segmentation, you can provide data in sales documents using requirement segments.
For more information about processing sales documents in the standard ERP system, see Sales (SD-SLS).
Prerequisites
You have made the following settings:
Segmentation structure and segmentation strategy are maintained in the Customizing for Segmentation under
SAP Implementation Guide 
Logistics - General 
The material is made segmentation relevant in material master
Fix segmentation has been chosen for the corresponding distribution center (DC)
Features
To sell materials with segmentation, the system allows you to maintain data in sales documents for the corresponding requirement segment. You can maintain requirement segment in sales document in one of the following ways:
manually enter requirement segment
copy requirement segment from preceding document
default determination of requirement segment based on the default value maintained for the characteristic maintained for the application area, in this case, sales order is the application area
For detailed information about how segmentation is handled in individual sales documents, see the following: