All materials come from either the Inventor Materials Library or the Autodesk Materials Library. You can define new materials and appearances as needed using the Material and Appearance tools. In the Sheet Metal Rule or in the Sheet Metal Defaults you specify additional material thicknesses as needed.
Create a new sheet metal material:
The creation of new materials is done outside the sheet metal environment. You can create new materials at any time, though it may be more efficient to create your typical materials in one session. Follow the steps outlined in the procedure for adding a new material.
When the new material is made, it populates the document automatically and is available in all environments. You can create a custom material library for your needs which would then be accessible to any project referencing the library.
To modify an existing material, see Edit Materials.
Accessing the new sheet metal material:
After creating one or more new sheet metal materials: