Create a negotiation for services

I'm looking to create a negotiation for a service (which in my company's business term this is a Tender) in Oracle Fusion Procurement, for example: computer system upgrade service. In our Oracle procurement system we use Smartform to manage the "service" procurement process thus "service" doesn't have item number in our system. Could anyone guide me through the steps or share any samples or resources that demonstrate the workflow or how to set this up the creation of services negotiation in the system?

Any helpful tips or best practices would be greatly appreciated! Thanks in advance~