Hello Sudeep,
The integration exists between Upstream Contracts and P2X solutions. In order for this to happen your site must be suite integrated. Once suite integrated you can create the link between Contracts Pro and P2X. You do this by accessing the documents tab while in a contract workspace then clicking actions > contract term.
However, if you are trying to create a link between the Event pricing in an RFx to a Catalog in P2P manual manipulation of data, and external system processes will need to be put in place. This is something I believe Ariba wants to get better at but at the moment I am not sure if there is a roadmap.
Thanks,
Robert