It is possible to configure a Buyer (the person in charge will stipulate the contract with the facility or with the service provider). It is up to the customer to decide whether to create as many Buyers as there are contractors or to create a Generic Buyer and use it for all contracts.
Follow the step: User Management > New User and create the new user by assigning "Buyer" as "Rights". Please note that this kind of user will have limitations in using the system.