MBOM vs EBOM

MBOM vs EBOM captures the two fundamental views of a product’s structure that any PLM system must reconcile. The Engineering BOM (EBOM) reflects how engineering decomposed the product as designed, while the Manufacturing BOM (MBOM) reflects how production will actually build it — including phantom assemblies, kit lists, consumables, and process steps.

What it covers

• EBOM — design-time hierarchy mirroring CAD assembly structure.
• MBOM — manufacturing-ready hierarchy with routings, work-centers, and consumables added.
• EBOM-to-MBOM transformation rules: re-leveling, substitutions, alternates, sourced vs make.
• Variant and effectivity rules that drive 150% / configurable BOMs.
• Reconciliation reports when engineering changes need to land in the MBOM.

Relationships (see sidebar)

• Supports the BOM Management process.
• Implemented by PLM platforms including Siemens Teamcenter, PTC Windchill, Aras Innovator, and Dassault 3DEXPERIENCE.
• Anchored on the Part Master data object.