# Duplicate column

The Duplicate column step enables you to duplicate a specific column. The duplicated column will be added to the end of the dataset.

### Step parameters

* `Duplicate column...` **column(string)\***: the column to duplicate
* `new column name` **string\***: Set a name for the duplicated column.

### Example

**Input**

<figure><img src="/files/G0b4omOHnutU2ynyiZQb" alt=""><figcaption><p>Column header - duplicate column input</p></figcaption></figure>

**Configuration**

```json
{
    "column": "Value",
    "new_column_name": "Value_duplicate"
}
```

**Output**

<figure><img src="/files/LEXIPTAjFEZZOO6PNjjK" alt=""><figcaption><p>Column header - duplicate column output</p></figcaption></figure>

{% hint style="warning" %}
an error will be raised if you try to set a name that is already used for another column.
{% endhint %}


---

# 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://docs-v3.toucantoco.com/data-management-in-datahub/datasets-in-toucan/preparing-data/overview-of-youprep-tm/column-header/duplicate-column.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.