> ## Documentation Index
> Fetch the complete documentation index at: https://www.integrate.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.
# ETL: Select Transformation
> Configure the Select transformation in Integrate.io ETL to choose, rename, reorder, and compute fields with expressions before passing data downstream.
Use the Select component to choose which fields from the input will be available in the next component and transform them using [expressions](/etl/using-expressions-in-integrateio-etl).
**To select which fields will be available in the dataflow:**
Add a Select component where required in your package.
Open the component and name it.
To automatically populate the fields section, click the Auto-fill fields
icon. Otherwise, use the field drop-down and select the field you require.
Use the expression editor to manipulate field data using Integrate.io ETL's
expression language (see [Using
Expressions](/etl/using-expressions-in-integrateio-etl) and [Integrate.io
ETL functions](/etl/integrateio-etl-functions)).
For each field row, assign an alias for your field in the right text box.
To change the order in which these fields will appear in remaining dataflow
components, click and drag the arrow located to the right of a field number
up or down to the new position. If required, add rows for additional fields.
## Related