Hi Jagan:
I contacted the SAP Ariba team that is working with Kennametal about your questions. Moving contracts to downstream is part of the function of an integrated realm (which KMT has). It is predicated by having both upstream and P2O. The product documentation at Ariba Connect can answer your questions about how to move a contract from upstream to being able to buy against it in downstream.
Regards,
Debbie Curtis-Magley
SAP Ariba Exchange Community Manager