Use this procedure to assign materials to the individual components of a curtain wall unit style. When you assign a material to a curtain wall unit component, the component uses the display properties of the material instead of the style display properties.
You can assign a material to any physical component of the curtain wall unit. Custom components and components that are only symbolic graphics do not use materials for their display properties. For example, the frame, mullion, and infill are physical components of a curtain wall unit. The cell marker is a symbolic component.

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Curtain Wall Unit Styles. If the setting for By Material is not available, the display of this component cannot be determined by a material.
You can select any material definition in the current drawing, or click
to create a new material definition and assign it to a component.