Purchasing Groups 
Note
The following information is relevant only if you integrate SAP Sourcing with SAP ERP. For more information, see Integration of SAP Sourcing and SAP ERP.
A purchasing group is a key for a buyer or group of buyers in SAP ERP. It is responsible for the procurement of a material or class of materials, and is the principal channel for a company's dealings with its suppliers.
Integration
Typically, purchasing groups are imported from SAP ERP to SAP Sourcing. For information about extracting purchasing groups from SAP ERP and importing them to SAP Sourcing, see the configuration guide for the integration of SAP ERP and SAP Sourcing on SAP Service Marketplace at http://service.sap.com/instguides 
SAP Business Suite Applications 
SAP Sourcing 
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You can also create and edit purchasing groups in SAP Sourcing manually, as described below.
Creating a Purchasing Group in SAP Sourcing
The purchasing group must exist in SAP ERP before you create it in SAP Sourcing.
Log on to SAP Sourcing as a user with system administration rights.
Choose Setup.
On the Master Data tab, find the Organization and Accounting Information section and click Purchasing Group.
Choose New.
Enter the required information as shown in the following table.
Field
Value
ID
Enter a unique ID that identifies the purchasing group in SAP Sourcing.
Name
Choose the desired language from the dropdown and enter a name and description in that language.
Description