View Public Works' open solicitations, and learn more about how to register as a supplier and submit a bid or proposal. The standard purchasing process for Allegheny County involves: requisitioning; public solicitation; bid and proposal receipt; evaluation and contract award.Construction contractors interested in performing construction contracts with the department must first complete the Vendor Registration process. RFPs outline the bidding process and contract terms and provide guidance on how bids should be formatted and presented. Questions regarding these projects shall be submitted via the "Clarifications from Vendors" feature within PennBid.