Multilevel BOMs Explained for Product Manufacturers

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It also incorporates the packaging materials required to send the product to the customer. It contains processes that require execution on the product prior to completion and stores all the information required for manufacturing activities. Engineering BOMs are specific to engineering used in the design process; manufacturing BOMs are specific to the manufacturing used in the assembly process. And looking at the indented bill of materials example, it’s largely due to a manufacturer having to follow not only the production of their finished goods but also their subassemblies.

  • This provides the complete list of the components or parts as designed by the engineering team.
  • By using the right kind of BOM for each stage, manufacturers can streamline their operations and guarantee the success of their products.
  • It’s an extensive list of raw materials, assemblies, items, components, and instructions to manufacture, produce, or repair a product.
  • Don’t leave information outside of the BOM because it will lead to mistakes, delays and unexpected costs.
  • For example, design and engineering staff typically use engineering BOMs, while the manufacturing team uses manufacturing BOMs, and sales executives mainly use sales BOMs.

Their bill of materials example can include all parts of a bike such as frames, wheels, chains, seats, handlebars, pedals, and cranksets, with details on the quantities and cost of each item. If you have questions or would like to know more about the bill of materials, OpenBOM support can help you, just get in touch! We also offer complete services to support your product development from prototype to production and maintenance. You will need to stay connected with multiple engineers, production planners, procurement, contractors and suppliers. Without successful collaboration, you won’t be able to define a correct Bill of Materials, which will lead to mistakes, additional cost and delays. It basically works like a recipe, where all important ingredients are listed.

Who Prepares a Bill of Materials? Who Uses a Bill of Materials?

A BOM is a listing of the quantities of each of the materials used to manufacture a product. BOMs help ensure third-party contract manufacturers are using efficient and accurate when production methods. You’ve probably noticed that Katana schedules production by the older MO first, which might appear confusing if your first MO is dependent on the status of another MO. Adopting cloud manufacturing software, like the one offered by Katana, into your manufacturing business will mean more control over your BOMs. Understanding subassemblies is essential as this is a key part of developing your multilevel BOM. Additionally, Enterprise Resource Planning (ERP) systems can help keep a constant track of changes to BOMs and spot errors that can happen when different teams create BOMs for the same product.

  • In process industries, the BOM is also known as the formula, recipe, or ingredients list.
  • It is absolutely critical to include ALL information needed to manufacture the product to the bill of materials.
  • You need to assign a unit of measure for each part, such as inches, feet, pounds, etc.
  • A subassembly can also function as a finished item sold separately to customers or used to finish constructing another product.

You need to have the ability to perform various analytics and calculations based on the BOM data. A bill of materials « implosion » links component pieces to a major assembly, while a bill of materials what is a hurdle rate « explosion » breaks apart each assembly or sub-assembly into its component parts. For example, a computer is exploded into hard drives, computer chips, random access memory panels, and processors.

A precise, rigorous BOM improves decision-making and facilitates efficient production processes. However, many companies are struggling with preparing and managing BOMs manually since it’s time costing and error-prone. Part number identifies a specific material or component, allowing anyone involved in the production process to easily identify what it is.

For product companies working with distributed teams and supply chain partners, collaborating on the latest bill of materials (BOM) is critical to reduce production errors and shipping delays. Furthermore, engineering teams will create engineering bill of materials (EBOMS) and the manufacturing teams will rely on manufacturing bill of materials (MBOMS). Typically, the engineering or manufacturing department is responsible for preparing the BOM. They are served with the responsibility of designing the product and determining the exact specifications of the necessary components before creating a list of materials required to create a bill of material. One of the greatest outcomes of using the bill of material is its ability to produce the cost estimation. This considers the list of components defined in BOM of finished products and allows you to generate the cost estimation.

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If you then go over to the MO screen by selecting MAKE at the top of the platform, you can select the MO to get more information on the production status. Katana centralizes your entire business, from your sales channels to manufacturing operations, to one intuitive, visual platform. When a product has multiple variants, it can be complicated to manage in Excel as the number of resolved BOMs will grow exponentially with the number of variants, very quickly becoming impossible to manage. If you want to set up your operation with the smoothest production flow possible, there’s a lot you need to do not to bog down your production later. This article will explore the world of multilevel BOMs and everything you need to know to get more control over them. Amaey Anand is a certified accountant with over 10 years of experience in the finance industry.

An accurate BOM supports efficient manufacturing processes

This not only wastes time but also compromises the accuracy of data used for crucial business decisions. Let’s say you decide to keep your multilevel bill of materials in a spreadsheet. The purchased parts and raw materials can also be found within a BOM level, which will look like a BOM tree. This particular format is characterized by increased detailing, which is suggested by its name. It covers various pieces of information, including the quantity, specific parts, corresponding part numbers, and the cost for each unit of measurement.

An MBOM is typically shared with several systems involved in procuring and constructing the product, such as an enterprise resource planning (ERP) system and a material requirement planning (MRP) system. As its name indicates, a manufacturing BOM is used during the manufacturing process. It identifies the parts and assemblies required to produce a shippable finished product. It determines the number of items and materials that must be purchased and at which stage they need to be available to meet the production schedule. The information it provides includes the basic data for business processes, such as manufacturing resource planning, product costing, material provision for production and plant maintenance. The bill of material for finished goods not only lists the components but also the quantity of each component required to produce the finished goods.

With a well-defined BOM, companies can accurately plan purchases of raw materials and their estimated costs, thus gaining better inventory control, ensuring a robust production process, and reducing waste. You can consider a customized solution to support you in creating and managing BOMs more efficiently, which frees you from manual work and human errors. In this way, you can maintain accurate records, improve your supply chain efficiency, and in turn, save you cost and increase your bottom line. A multi-level bill of materials (BOM), referred to as an indented BOM, is a bill of materials that lists the assemblies, components, and parts required to make a product in a parent-child, top-down method. It provides a display of all items that are in parent-children relationships. When an item is a sub-component, of a (parent) component, it can in-turn have its own child components, and so on.

BOM level

It helps organizations with accurate materials management and production planning, cost estimation, inventory management, and minimizing production delays and waste. Here, you can input the subassemblies’ information, including the sale costs, ingredient costs, operation costs, quantities, the required materials/components, and the production process to make the subassembly. And for companies that rely on supply chain partners, it’s important to provide effective revision control throughout the new product development and introduction (NPDI) process. Any time the BOM is shared with a contract manufacturer (CM) or supplier, it should be the latest released revision to prevent unnecessary production mistakes and product launch delays.


Another way to present all components needed to manufacture the product is to present a flattened list of all items used in multiple assemblies. Such a BOM is critically important for planning and procurement because it gives an easy way to access all information and it works as a summary of all component quantities used in multiple assemblies. The benefit of using CBOM structure is that it reduces the work-effort needed to maintain product structures. The development of the CBOM is dependent on having a modular BOM structure in place.

It’s an extensive list of raw materials, assemblies, items, components, and instructions to manufacture, produce, or repair a product. It is presented in a hierarchical format, where the highest level displays the complete product, next is the subassemblies, and the bottom level shows individual items and materials required for the production. This consists of details like names, numbers, descriptions, the quantities needed, and the steps to create the item. A bill of materials (BOM) provides a complete list of all the materials, components, and parts necessary for producing a final product. It guarantees that all required items are accounted for and assists in managing inventory, manufacturing processes, and costs during the entire product development lifecycle. A bill of materials (BOM) provides essential pieces of information such as the quantity, description, specifications, costs, and suppliers of each item needed for manufacturing.

The resulting top-level BOM (item number) would include children; a mix of finished sub-assemblies, various parts and raw materials. In contrast, a single-level structure only consists of one level of children in components, assemblies and material. A bill of materials (BOM) is a comprehensive inventory of the raw materials, assemblies, subassemblies, parts and components, as well as the quantities of each needed to manufacture a product. In a nutshell, it is the complete list of all the items that are required to build a product.

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The format of bill of materials varies but it contains the essential details as discussed in the above sections. An engineering BOM, developed by engineers, is used when you need to design a product. This is a unique number assigned to each part that shows where it fits in the BOM hierarchy. For example, a BOM for a vehicle has each major component marked as a level, like engines, doors, drivetrain. Each of these components is broken further into sublevels, such as an engine consisting of pistons and crankshaft, and the pistons including piston rings in a lower level.

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