> For the complete documentation index, see [llms.txt](https://documentation.astera.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.astera.com/dataprep/layout/add-column.md).
# Add Column
In this document, you will explore how to add a column in Astera Dataprep.
1. To add a column, click *Layout* in the toolbar and select *Add Column.*
2. Once done, the *Recipe Configuration – Add Column* panel will open.
3. In this panel, you can specify the *Name, Type, Header, Position,* and *Index.*
* **Name:** The name of the new column.
* **Type:** The datatype of the new column to be added.
* **Header:** Specifies the column name when writing to a file.
* **Position:** Consists of various options to help specify where the new column should be added.
* **Index:** Adds the column at the specified Index position.
* **Start:** Adds a column to the start of the dataset.
* **End:** Adds a column to the end of the dataset.
* **Move Before:** Adds a column before a specified column in the dataset. Once selected, you must specify the column through the Reference drop-down.
* **Move After:** Adds a column after a specified column in the dataset. Once selected, you must specify the column through the Reference drop-down.
* **Value:** You can specify the expression that you want to be applied on the objects for the new column.
* This can be done directly in the expression box, or you can open the *Expression Builder* by clicking  next to the expression box.
* Here, we have simply added 100 to our existing ‘*Freight*’ value.
4. Now, let’s select *Apply*  to add this new column to our dataset.
5. Once done, you can see that the new column with your specified configurations has been added to the grid.
---
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3. In this panel, you can specify the *Name, Type, Header, Position,* and *Index.*
* **Name:** The name of the new column.
* **Type:** The datatype of the new column to be added.
* **Header:** Specifies the column name when writing to a file.
* **Position:** Consists of various options to help specify where the new column should be added.
* **Index:** Adds the column at the specified Index position.
* **Start:** Adds a column to the start of the dataset.
* **End:** Adds a column to the end of the dataset.
* **Move Before:** Adds a column before a specified column in the dataset. Once selected, you must specify the column through the Reference drop-down.
* **Move After:** Adds a column after a specified column in the dataset. Once selected, you must specify the column through the Reference drop-down.
* **Value:** You can specify the expression that you want to be applied on the objects for the new column.
* This can be done directly in the expression box, or you can open the *Expression Builder* by clicking  next to the expression box.
* Here, we have simply added 100 to our existing ‘*Freight*’ value.
4. Now, let’s select *Apply*  to add this new column to our dataset.
5. Once done, you can see that the new column with your specified configurations has been added to the grid.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation by asking a question.
Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters:
```
GET https://documentation.astera.com/dataprep/layout/add-column.md?ask=