> For the complete documentation index, see [llms.txt](https://manual.firstresonance.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manual.firstresonance.io/features/parts-and-trace/trace-aboms/editing-abom-build-requirements.md).
# Editing aBOM build requirements
## Adding and removing requirements
Build requirements can be added to the aBOM if additional parts are required to be installed. This is the equivalent of redlining for aBOMs.
As shown above, manually created build requirements can also be removed when editing the aBOM. If a build requirement is associated to a mBOM item, it cannot be deleted to help you compare the final aBOM state to the mBOM. You can, however, zero out the quantity of those build requirements you no longer need that are associated to mBOM items. Build requirements with a quantity of zero will not count towards the aBOM completion percentage.
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