The Project Manual comes with the drawings in the bid packet. It can run to hundreds of pages. Most of it does not concern your trade.
A gym equipment contractor needs the front end, Division 01 and the athletic equipment section. A painter needs the front end, Division 01 and the painting section.
Start with the table of contents. Mark your sections and every section they refer to. Read the front end for bonds, wage rules, tax status and dates.
Takeoff Tool finds your spec section inside the full Project Manual and lists what the section requires.