Hi acharya,
Information on Customizing is available in the IMG under Customer Relationship Management® Transactions ®Settings for Opportunities® Sales Methodology ® Define Texts for Goals, Competitor Analysis and BuyingCenter.
Make the settings for the buying center in Customizing for partner processing. Information on this is available in the Implementation Guide under Customer Relationship Management->Basic Functions ->Partner Processing ->Partner Teams.
The attributes, attribute values, relationships and relationship categories can be pre-defined here.You can create notes for the individual roles/people in the buying center. Notes can also be pre-defined in Customizing, from which the sales employee can then choose.
You can create additional texts for each person in the buying center. For example, this could be a person’s personal value proposition or personal criteria for reaching a decision.
Further information on partner teams is available under Partner Teams.
You can make the settings for text processing in the Implementation Guide (IMG) for CRM under Customer Relationship Management ->Basic Functions ->Text Management.
In order that these texts appear and can be maintained in the buying center for the opportunity, you need to assign the corresponding text determination procedure to the transaction type.Make this assignment in Customizing under Customer Relationship Management -> Transactions ->Basic Settings ->Define Transaction Types (Customizing header, Field: Texts Project Partners).
At present, only the graphical display is available for the buying center on the People-Centric UI; graphical maintenance is not possible(if you are using People-Centric UI).
You can also refer to http://scn.sap.com/docs/DOC-5051.