Use Appearance
When Use Appearance is selected, all components in the model are sorted by appearance instead of the default physical material type. Also, the Board Type list title will indicate (Appearance) on the lumber tab.
When maps are created, components are placed on the board types of corresponding appearance and thickness. Typically, one would apply the expected appearance to the various components in the model, giving it a realistic look. You can also create your own named appearances and apply them to a sub-group of components. When the map is created, the subgroups will be arranged together on separate boards.