Grouping of Materials for User-Defined Materials
When creating materials for a user-defined material, you can add Group nodes to create folders in the material library or to define a phase or a phase and orientation in the Material Library Settings section.
Material Library Settings
Select the Material Library Settings check box in the Show More Options dialog box to display this section.
From the Group type list, choose one of the following options:
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 Library folder (the default), to use the Group node’s label as a library folder for organizing the material library into groups of material.
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Phase, to use the group for defining variations of a material with different material phases and possibly also orientation or variation. You define those properties in the Material subnodes’ Material Library Settings sections.
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 Phase and orientation, to use the group for materials with a certain phase and different orientation or variation. You define the orientation or variation in the Material subnodes’ Material Library Settings sections. From the Phase list, choose Custom, Solid, Liquid, or Gas to define the phase of the materials in this group.