Learn about switch materials in VRED.
For additional information on switch materials, see the following:
Video captions: Craete a switch material and assign it to the carpaint geometry. As an aid, select the carpaint material that is already assigned to the geometry. Upon calling up the Material Editor menu with the right mouse button, pick Select Nodes. Assign the switch material to the geometry by running the command, Apply to Selected Nodes. Duplicate the carpaint material multiple times and change each diffuse color as you feel. Subordinate the created carpaint materials via drag and drop to the switch material. Within a switch material, multiple different materials can be integrated and selected between them. The currently selected one is active, while all others remain inactive. All the materials can be changed via the commands, Move Up and Move Down, after invoking the Switch Material menu with the right mouse button.