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Creating manufacturing BOMs > Creating product structures > Authoring MBOM > Managing reused assemblies in an MBOM

Add and align parts in a reused assembly

In cases where changes are made to parts in the EBOM (for example, one or more arm rests of a chair assembly have moved, the chair itself and therefore all of its parts have moved, more than one chair location needs to be adjusted, or parts are added), you must realign the assembly with the EBOM to ensure that all reused assemblies in the MBOM reflect those changes. You can add new parts to and align moved parts in a single reuse instance or to all instances in your MBOM.

Prerequisites

Ensure that the value of the preference MEEnableAlignmentForReusedAssemblyPairs is set to false to control creation or alignment of reused assemblies (the default value is false).

Procedure

  1. If the EBOM and MBOM are not already linked, link them using the Link Associate→Link Structures command.

  2. (Optional) If you are viewing unconfigured structures, turn them off so that you have 100% BOMs by deselecting the show unconfigured toggles.

While you can run the alignment without fully configuring the structures, not all lines may be aligned.

  1. In the EBOM, copy any parts to be added, and in the MBOM, paste the parts to any appropriate reused structure.

  2. In the EBOM and MBOM, select the structures to be aligned and choose Tools→Manufacturing Alignment→Align Reused Assemblies.

The Line to be aligned and Line to align with boxes should match.

  1. If it is not already selected, from the Reused assembly list, select the reused assembly.

  2. Do one of the following.

To align only the reused assembly selected in step 4, rather than all reused assemblies (default), select Align reused assembly.

To align all reused assemblies, select Align all reused assemblies.

  1. To align all properties in the MEAlignedPropertiesList site preference, select the Align properties check box.

  2. Click Align.

Results

The parts and reusable assembly are aligned as you specified.

Source: https://docs.sw.siemens.com/en-US/doc/282219420/PL20251212545240207.xid1364469/xid1019295 · retrieved 2026-07-11