Discover what a bid proposal is, the elements of a bid proposal, how to create one and a template and example that can guide you. Here is a proposal cover letter template.The above sample was used with this template as a base. Instantly draft and send a business proposal template to establish the terms and conditions between your business and clients. We have reviewed ten of the best proposal templates we could find online across various industries. These proposals showcase multiple proposal formats. Here are a few example proposal letters to inspire you as you create your own. Scope of Work Template, Scope of Work Template. How to write a proposal letter Introduce yourself and provide background information. State your purpose for the proposal.