# Passthru Transformation

A Passthru Transformation creates a new dataset based on the elements that were passed to the transformation. This is useful for organizing datasets for better readability and grouping of values that are otherwise calculated over and over again (e.g. a [Sequence Generator Transformation)](https://astera.zendesk.com/entries/21435108-Sequence-Generator).

## **Usage**

To use a Passthru transformation, drag and drop the *Passthru* Transformation from the *Transformations* Group in the Flow toolbox to the flow designer.

![](/files/6FH9VoM0m8FaGZZ1HyZb)

Map all the data to the *Passthru* transformation created by the flow designer. These will be the data for the new dataset.

The properties window has the option of adding new member objects, or *Collection Objects*. This is where the dataset can be organized based on what is needed.

![](/files/8h785hV4AOrZDcW445Zm)

## **Example**

In this example, we are creating a new dataset from:

* the EmployeeID and LoginID from an Excel source file
* a Variable called RoomID
* a Sequence Generator Transformation which will generate the CubicleID

and mapping it to two Excel destination files.

The Passthru Transformation gives a nice option of grouping the data needed for other tasks and storing any calculated data for each element of the dataset. In this example, the Sequence Generator can assign a unique CubicleID for each employee and still retain the same value on both the excel destinations.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://documentation.astera.com/astera-data-stack-v6/dataflows/transformations/passthru-transformation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.