You simply put the book on the table using the map editor instead the event. There are only 2 layers in maps, the floor level in TileA and the level 2 from B to E. To have a third level to put something on tiles from B to E you have to use an event. Select the tile, create a new event, select the graphic (you may select some tiles from the tilesets too) and you can have a book on the table :D But keep in mind that the book you used will be on the border. You may need to modify the tileset.