UNSPSC Taxonomy
Basics
The United Nations Standard Products and Services Code is an internationally recognized classification system for goods and services.
The specification calls for four levels:
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Segment - 
A logical aggregation of families useful for analyzing trends. 
 
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Family - 
A related group of class categories. 
 
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Class - 
A group of commodities with common characteristics, but not necessarily interchangeable with each other. 
 
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Commodity - 
A group of interchangeable items. 
 
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After loading the UNSPSC matrix to the four tables representing each level of classification, assign codes to Catalog Items.