Overview
About design and engineering BOM alignment
In a PLM system with design-part separation, the design and engineering BOM (Usage BOM or Assembly BOM) of a product are managed as separate entities. Designers and BOM engineers manage the design and engineering BOM independently as per their business requirements.
The following video shows why it is beneficial to keep the design and engineering BOM separate, and later align the two to perform engineering BOM-driven digital mockups:
Before manufacturing a physical product, it is conceptualized and developed using a 3D visual representation. By visualizing a product, visual product validations such as clearance checks can be performed. When the design and engineering BOM are managed separately, they must be aligned in order to visualize a product.
The following video explains different types of alignment you can perform:
Consider that your company manufactures a racing car called CrossKart. You want to visualize what the part Wheel looks like. For this, you align the part Wheel with its design. In Teamcenter, this alignment is known as design-part alignment.
Now you know what the wheel looks like in its floor position.
Next, to visualize how the four wheels are placed in CrossKart, you must align each instance of the part Wheel with the corresponding design occurrence. A design occurrence has the absolute position information of a part. In Teamcenter, this alignment is known as design occurrence-part occurrence alignment.
Now you know how the four wheels are placed in CrossKart.
Where do I go from here?
Administrator
See Design and BOM Alignment ─ Deployment and Administration.
Business User
New user
Familiarize yourself with the design and engineering BOM terms used in Teamcenter. You can also look at the task flow to align the design and the engineering BOM.
Align the design and engineering BOM automatically
See how to generate an aligned engineering BOM from a design structure and how to generate and aligned design structure from an engineering BOM
Manually align designs and parts
Learn about aligning designs and parts.
Align design occurrences and part occurrences in a flexible part
A flexible part can be represented by different designs or using the same design but with shape overrides. Learn how to align design occurrences and part occurrences in a flexible part.
Verify if the alignment is performed correctly
See how to validate the alignment between designs and parts and between design occurrences and part occurrences.
Update an engineering BOM based on the design changes
Learn about the different ways to update an aligned engineering BOM. You can also learn about the different ways to update a design structure based on the engineering BOM changes.
Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.dbom_ebom_alignment_usage/xid1925408 · retrieved 2026-07-11