There will be a bid form provided that will need to be filled out completely for your bid to be in compliance. Invitation to Bid (ITB). 5. 3.02.Request for Proposals (RFP). 6. 3.03. Harris County Purchasing Department utilizes Bonfire to manage suppliers and to distribute and receive bids and proposals online. Section 3 Bid Requirements Offeror must complete and submit the Section 3 Utilization. The advertisement contains a short description of the products or services desired, the job number, the time and date the responses are due and location. Harris County will provide the appropriate bond documents to the awarded vendor to complete and submit prior to commencing any work. Fill out and return to the Harris County Purchasing Department ONE (1) complete proposal form in an appropriately sized envelope or box.