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. Below is an outline of proposal format and what is needed from the proposers.Submittal Instructions: Electronic PDF file format via Planetbids on the date and time stated in the RFP. The Housing Authority of the County of San Bernardino (HACSB) is seeking a qualified Armed. Proposals must be submitted in 8½" x 11"page format. 3. All proposal pages must be numbered. 4. Please read the application thoroughly. Proposal budgets should include all necessary expenses for the Proposer to complete the project. Superior Court of California County of San Bernardino. Housing in San Bernardino County.