The product categories are defined in UNIFORMAT II available at https://arc-solutions.org/wp-content/uploads/2012/03/Charette-Marshall-1999-UNIFORMAT-II-Elemental-Classification....pdf
Major Group Elements (Level I) include high level categories such as “Substructure” and “Shell.”
Group Elements are (Level II) include sub-categories within Level I categories such as “Foundations” under “Shell.”
Individual Elements are (Level III) include sub-categories within Level II categories such as “Slab on Grade” under “Foundations.”
The current version of BEES includes 7 elements: