> ## Documentation Index
> Fetch the complete documentation index at: https://docs.firstresonance.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Trace as-built inventory

> Explore a unit's as-built genealogy interactively: what was installed into it, and which parent assemblies contain it.

In ION, go to **Quality** > **Trace (as-built)**.

## Start a trace

1. Under **Part**, search by part number and select the part.
2. Under **Inventory Instance**, select the serial or lot number to trace.
3. Click **View aBOM Trace**.

Units you traced before are listed under **Recent Searches**, so you can reopen one in a click.

You can also jump straight into a trace from a record: click **View aBOM** on a part inventory, in an inventory table, or on a received unit on a receipt.

## Read the trace

The trace shows the unit's as-built tree from the top down: the selected inventory at the root, its build requirements as branches, and the installed serials and lots beneath them, recursively through every sub-assembly.

* Switch between the **Graph** and **Table** views. The table adds **Status**, **Quantity**, and **Completion** columns per row, and build requirements show installed versus required counts.
* The **Used in** strip lists the parent assemblies this unit is installed in. Click a parent to re-root the trace on that assembly, which is how you answer "where did this lot end up?" for a recall or supplier escape.
* Click **Search** (or press **Cmd+K**) to find a part, serial, or lot inside the trace and focus it.
* Click any node to open its detail panel, with **Overview**, **Runs**, **Quality**, and **Supply** tabs covering the unit's install progress, origin and installation runs, related issues, and the supplier and purchase order it was received on. **View Inventory Details** opens the full inventory record.
* Click **Export** and choose **Export as CSV** or **Export as JSON** to take the whole tree with you.

## Related

* [As-built BOM (aBOM)](/build-hardware/bills-of-materials/as-built-bom)
* [Split inventory on a run](/build-hardware/runs-and-execution/split-inventory-on-a-run)
* [Get an aBOM with full hierarchy](/api-reference/examples)