Is their a book for layouts that has multi-level, grades etc.
Yes, there are many but the one I still refer to while building layouts after 10 years…put out by Atlas Model railroading. It is a very basic book and describes 7 different layouts including diagrams, material needed and much more. Companion bboks are available for wiring a layout and basic scenery as well. There are also many of us in the hobby that will supply you with as much info on this subject as you could possibly need…for free.
Best of luck,
johncpo