> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/modify-values-from-grouped-rows/grouping-fields-modify-values-from-grouped-rows.md).

# Grouping fields

![Modify values from group rows step window](/files/rNRyQgAcyuQ3TYBYwEgd)

| Field             | Description                                                            |
| ----------------- | ---------------------------------------------------------------------- |
| **Field name**    | Specifies the field name that will be used to group the incoming data. |
| **Pass Through?** | Select to add the specified incoming field to the output fields.       |

In the \*\*Target hierarchical\*\* field, you can specify a new field name to be added into output or select an incoming hierarchical field name to modify.

**Note:** If the target field is an existing field, it must be included as one of the grouping fields.


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