Contract that can be used with Multiple Suppliers

Summary

Need to setup one contract that can be used with multiple suppliers

Content

We have a business requirement where we have an organization wide contract for a service that can be fulfilled by a pool of suppliers. Is there a way to create a single global contract and assign the pre-determined pool of suppliers to this contract. When the service is required a req or PO needs to be issued to one of the suppliers in the pool assigned to the contract. The goal is to have one contract and track spend across a pool of assigned suppliers.