Use the Material Parameters dialog to specify values for custom parameters that you create.
 For example, you might create a custom parameter to indicate whether a material is recycled and enable the parameter when you edit a material. 
- Open the material in the Material Editor panel of the Material Browser dialog. 
 
-  In the lower left corner of the Material Browser dialog, click 
  
 Custom Parameters. 
  Note: The Custom Parameters button displays only when custom parameters have been added to the current project. 
  
 
 
- In the Material Parameters dialog, specify values for the custom parameters created using the Project Parameters command. 
 
- Click OK.