Each division covers one area of work. Division 03 is Concrete, Division 08 is Openings, Division 09 is Finishes and Division 26 is Electrical. Each division breaks into numbered sections.
Example: a door hardware supplier looks for Section 08 71 00, Door Hardware. A gym equipment supplier looks in Division 11, Equipment.
Use the numbers to find your work in the Project Manual table of contents. Then search related divisions, because your items can appear elsewhere. Organize your proposal by section number. General contractors sort bids by these numbers.