The BOM Procedure

Overview

The BOM procedure is an experimental procedure for performing bill-of-material processing. It composes a series of single-level bills of material into a multilevel tree-structured bill of material, determines the level of each part in the bill, and represents the multilevel bill of material structure in the form of an indented bill of material. PROC BOM can also output a summarized bill of material.

A bill of material (BOM) is a list of all parts, ingredients, or materials needed to make one production run of a product. The bill of material may also be called the formula, recipe, or ingredients list in certain process industries (Cox and Blackstone 1998). The way in which the bill of material data are organized and presented is called the structure of the bill of material or the structure of the product.

A variety of display formats is available for bills of material. The simplest format is the single-level BOM. It consists of a list of all components that are directly used in a parent item. A multilevel bill of material provides a display of all components that are directly or indirectly used in a parent item. When an item is a subcomponent, blend, intermediate, etc., all of its components, including purchased parts and raw materials, are also exhibited. A multilevel structure can be illustrated by a tree with several levels. An indented bill of material is a form of multilevel BOM. It exhibits the final product as level 0 and all its components as level 1. The level numbers increase as you look down the tree structure. If an item is used in more than one parent within a given product structure, it appears more than once, under every subassembly in which it is used. The summarized bill of material is another form of a multilevel bill of material. It lists all the parts and their quantities required in a given product structure. Unlike the indented bill of material, it does not list the levels of parts and does not illustrate the part-component relationships. Moreover, the summarized bill of material lists each item only once for the total quantity required. Refer to Cox and Blackstone (1998) for further details.

The indented bill of material data generated by PROC BOM are organized in such a manner that they can be easily retrieved and manipulated to generate reports, and can be used by other SAS/OR procedures to perform additional analysis. The summarized bill of material data are quite useful in gross requirements planning and other applications.

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