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The mBOM is a part’s planned parts list. See Bills of materials overview for how it relates to the aBOM and build requirements. This page covers building and consuming it.

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mBOM line items

The mBOM table shows these columns per build requirement line:
ColumnNotes
Part Number / RevThe required part, shown with its revision
QuantityHow many of the part go in. Multiplied by the parent’s run quantity at execution time
SubstitutesApproved alternate parts. See Alternates and substitutes
Reference DesignatorsPositional identifiers such as R12, U7, and Q1. See Reference designators
Made on AssemblyWhether this part is built directly onto the parent. See Made on assembly
For the GraphQL shape, see mBOMs API.

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Creating an mBOM

  1. Open the parent part in the Parts Library.
  2. Find the mBOM card on the part page. If the part has no mBOM yet, click Create mBom.
  3. With the version in Draft, click New Part and pick the child part. ION adds a line with a quantity of 0.
  4. For each line, set the Quantity and optionally add substitutes, reference designators, and the Made on Assembly checkbox directly in the row.
Edits save as you make them; there’s no separate save step. mBOM lines are editable only while the version is in Draft. For version states and the release flow, see Manage BOM versions.
The mBOM card on the part page is a quick editor. For the full mBOM, including its complete version history, use the Go to full mBom link in the card header.