Working with Materials > Defining Materials and Calculating Properties > To Assign a Material to One or More Parts
  
To Assign a Material to One or More Parts
1. Select one or more parts, right-click, and choose Edit Properties from the shortcut menu. The Part Properties dialog box opens.
2. Under Component Material, click Set Material. The Set Material dialog box opens.
3. In the Density Units box, select a unit.
4. Select the material from the list and click OK. The properties are calculated and the results appear under Component Summary.