A Request for Proposals (RFP) from the Minnesota Department of Commerce is a formal invitation to potential contractors or grantees to submit a proposal. Pre-letting (how to bid). Steps.General guidelines on how to prepare and submit a bid: Complete and include all required forms. The vendor overview is a general guide to assist new or returning vendors learn how to navigate the vendor registration process. Here are some of the forms you may encounter: Bid bond. A listing of requests for proposals (RFPs) from League of Minnesota Cities member cities seeking expertise and services from vendors. 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.