I am using MS Word to write a technical book. Because it is long (300-400 pages), it is divided into a few files. I also use Mathtype for equations. It works relatively well on single chapter level. However, occasionally I need reference a numerical item (Chapter/Sections) or a Figure, a formula number, and etc. I know I can combining them in a single master document but it will be very long. My question is that if it is possible to reference an item in another documents without combining them. It doesn't need auto update. Manual update is fine from time to time.
Any help will be greatly appreciated. Thanks in advance.