Pre-letting (how to bid). Steps. All bids must be submitted electronically via Bid Express.The Solicitation and Opportunity page provides links to the Supplier Portal for current solicitation postings, a list of currently expiring contracts. If you want to bid or serve as a contractor on a state construction project, keep your eye on this page for the latest solicitations and announcements. This practice involves leaving a small amount of material to be picked up next time and worked back across the road for filling small depressions. Submit a bid or proposal. In order to submit a bid for a transportation project on One Office, potential bidders will need to follow the below steps. Sign up or login with ConneX. Bids must be filled out and delivered to the address in the Bid Advertisement. This document is a bid document for a bridge construction project in Ethiopia.