The standard purchasing process for Allegheny County involves: requisitioning; public solicitation; bid and proposal receipt; evaluation and contract award. An RFP is a type of invitation to bid.Bystep guide to understanding the bidding process, along with tips on submitting a successful bid. This bid will rarely be less than the cost and taxes that have been totaled to bring the property to sale. Bids may be uploaded to the Authority's online submission site; the link is accessible via the HACP website and within the IFB. In the procurement of professional services. One way to promote competition in professional services is to issue requests for proposals (RFPs). Federal Register Circular 570 is available for inspection in the Contract Office, Room 504, County Office Building, Pittsburgh, PA 15219.