For modifying the list of materials you open the Materials dialog. This dialog is available in Materials Mode and in Simulation Mode and allows you to add, replace and delete materials or to modify their properties, see Modifying Materials Properties.
If you designed or imported a new furnace, the list of materials in the Materials dialog and the material list box in the tool bar will be empty.
You have the following options to add materials to the furnace:
You use a material database.
You enter the required materials and their properties manually.
You use materials saved in a *.mat file (rarely used).