How do I submit a bid or proposal? All formal bids and proposals shall be submitted as specified in the solicitation document.1. Once logged into APP, select the Sourcing tab on the top header and then click Manage my Proposals on the dropdown menu. a. Submitting your bid can be done either physically at the office noted in the bid advertisement or online at the BidExpress website. Registration is simple, easy and FREE. Bidding on ADOT and other public contracts can be complex. The following pages are intended to guide you through that process. Jump to section: Step 1: Selecting a Contract Step 2: Collecting the Necessary Information Step 3: Choosing a Negotiator Step 4: The Contract Review Process FAQs on the topic of procurement and bidding for Arizona school districts.