Extend a seeded Oracle OAF page to display results based on additional search parameter

I need a freelancer who can extend seeded Negotiations (RFQ) page in Oracle Sourcing. We are on Oracle Apps 12.2.x. We want to add "Item Number" as an additional search parameter in the Advanced Search region of this seeded page. When a user enters a value in the new Item Number field, this seeded OAF page should be able to take the item number value and use it in existing VO to display results in the result table below