In this article, we discuss how to write a business proposal letter and we offer sample letters and templates you can use as a guide. Download Nevada Business Proposal template, modify and send for signing using BoloForms Signature.Instantly draft and send a business proposal template to establish the terms and conditions between your business and clients. Please take a few minutes to fill out a brief survey, available in English and Spanish. Make this a well thought-out plan of action. Nevada Free Letter of Intent ( LOI ) Template. Utilize our Letter of Intent to formally express your desire to buy a product or service. Professional services proposals define the scope and timeline of a project. Get it right and it helps you win more clients. Professional services proposals define the scope and timeline of a project.