OpenBOM 101 – Flattened BOM

Oleg Shilovitsky
Oleg Shilovitsky
19 May, 2019 | 2 min for reading
OpenBOM 101 – Flattened BOM

To manage parent-child relationships is a fundamental function in the Bill of Materials. OpenBOM does it on demand by connecting Part Numbers. It is a very useful function that can apply in many situations. You can think about complex structure, order or anything like this.

While Multi-level BOM is a structure, you can think of a flattened BOM as a list of all the parts from all levels of your BOM listed together and the aggregate total quantities for each part are shown. It’s a great way to see the quantities of ALL Parts (no matter what level of the BOM they appear) with their summed quantities.

Flattened really only makes sense for a multi-level BOM. The following picture can give you an idea about what is flattened BOM:

Think about simple skateboard combined of board, screws, axle, wheels and more screws. Altogether, you can see them organized in an assembly (Skateboard) and subassembly (Axle Assy). However, when you get to a single-level BOM, you will see only one level including Parts and next level assemblies. The purpose of the Flattened BOM type is to display a flat representation of your BOM with distinct components and corresponding quantities collected from all sub-levels of a specific assembly.

The following video gives you a very short demo of flattened BOM in OpenBOM

Conclusion

OpenBOM Flattened BOM is an out-of-the-box quantity roll-up mechanism that can be used practically in any BOM structure. OpenBOM creates parent-child relationships on demand by connecting BOMs using Part Numbers (ID). Note- it CAD integrations it is the file name. By using Flattened BOM, you can get a summary of parts and their quantities in ANY product structure.

Best, Oleg

PS. Let’s get to know each other better. If you live in the Greater Boston area, I invite you for a coffee together (coffee is on me). If not nearby, let’s have a virtual coffee session — I will figure out how to send you a real coffee.

Want to learn more about PLM? Check out my Beyond PLM blog and PLM Book website

Related Posts

Also on OpenBOM

4 6
16 September, 2026

From checking readiness to supporting the decisions that make delivery possible. A product can begin drifting toward a late launch...

14 September, 2026

Shop Floor and Supplier Access to BOM, Drawings, and 3D Models  Shop floor access to engineering data means giving a...

11 September, 2026

How thumbnails, drawings, lightweight 3D files, and an integrated viewer help a team move from a BOM finding to a...

10 September, 2026

Review builds context. Agents put it to work. Decisions write it back. Why AI agents in manufacturing need a Product...

9 September, 2026

For the last few months, I had multiple conversations with people responsible for delivery hardware products – complex equipment, high-tech...

8 September, 2026

Welcome to the OpenBOM September 2026 update! The September update focuses on giving teams tighter control over who sees what...

4 September, 2026

Importing product data has always been one of the most frustrating parts of engineering and manufacturing software. The reason is...

4 September, 2026

Yesterday, I introduced the new OpenBOM Product Tour and showed how OpenBOM connects the product development lifecycle from CAD files...

3 September, 2026

Imagine it is three days before an important product launch, prototype build, qualification milestone, or customer delivery. Here is how...

To the top