Use the Material list dialog to:

At the top left of the dialog is a list of defined materials. These materials will be presented on the material selection lists in Autodesk AutoCAD Structural Detailing - Formwork Drawings. When you select a material from the list, the basic parameters of the material (such as graphic preview and unit weight) display.
Use the icons in the dialog:
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 Create new - opens the Material definition dialog where you can define a new material. The defined material is added to the list of available materials in the project.  | 
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 Modify - opens the Material modification dialog where you can define parameters (such as name and graphic parameters) of a selected material.  | 
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 Delete - removes a selected material from the list of available materials in the project.  | 
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 Save to database - saves the material to an external database file.  | 
The options on the expanded dialog:
To add a material from the database to the list of materials available in Autodesk AutoCAD Structural Detailing - Formwork Drawings, click 
 (Add). The material will be added to the list that displays at the top of the dialog.