The Material database dialog displays after you click Database on the Materials tab of the Project preferences dialog.
In the dialog, you can add materials from databases accessible in the program to the list of available materials. To add a material to the list:
- Choose a material database from the selection list provided in the top part of the dialog (for example, 001, an American material database).
- Select a material type in the left pane
- Click Add >.
Clicking Add all >> adds all the materials included in the left pane.
Clicking 
deletes a selected material from the list of available materials.