# Data Sets

> Create a data set of reusable test data, link one to a test case, understand what happens when you link more than one, and remove rows and columns.

**A data set** is a table of reusable test data, with a column for each variable and a row for each set of values. Link one to a [test case](https://testsigma.com/docs/arcus/v2/create-and-manage/test-cases/) to supply the case with those values instead of entering data by hand.

This page covers creating a data set, linking one to a test case, what happens when you link more than one, and removing rows and columns.

## Create a data set

1. In the left navigation, open **Data Sets**.

2. Click **Create** in the top right. The **Create a Dataset** dialog opens.

3. Enter a **Name**. A **Description** is optional.

4. Click **Create Dataset**.

5. On the **Data Set details** page, enter a distinct variable name in each column header, then enter the values beneath them.

6. Click **Add Column** for another variable, or **Add Row** for another set of values.

The data set is now reusable across your test cases.

## Create a data set from a test case

1. In the left navigation, open **Test Cases**, then create or open a test case.

2. On the **Test Case details** page, go to the **Data Set** section and click **Create Dataset**.

3. Enter a **Name**, optionally a **Description**, and click **Create Dataset**. The **Create a Data Set** dialog opens.

4. Enter a distinct variable name in each column header, then enter the values beneath them.

5. Click **Add Column** for another variable, or **Add Row** for another set of values.

6. Click **Link Dataset**.

## Add a data set to a test case

1. In the left navigation, open **Test Cases**, then create or open a test case.

2. On the **Test Case details** page, go to the **Data Set** section and click **Add Data Set**. The **Add Data Set** dialog opens.

3. Select a data set from the list and click **Next**.

4. Select the rows whose values you want the test case to use, or select all of them.

5. Click **Add Data Set**.

## Link more than one data set

Repeat the steps above to link a second data set. Arcus then combines them by Cartesian product, generating one test scenario for every combination of rows across the linked data sets.

Suppose Dataset A holds names and countries:

| Name | Age | Country |
| :--- | :--- | :--- |
| Alice | 30 | India |
| Bob | 25 | Japan |

And Dataset B holds plans:

| Plan | Price | Currency |
| :--- | :--- | :--- |
| Pro | 10 | USD |
| Free | 0 | INR |
| Enterprise | 50 | JPY |

Linking both produces 6 test scenarios, one per combination:

| Name | Age | Country | Plan | Price | Currency |
| :--- | :--- | :--- | :--- | :--- | :--- |
| Alice | 30 | India | Pro | 10 | USD |
| Alice | 30 | India | Free | 0 | INR |
| Alice | 30 | India | Enterprise | 50 | JPY |
| Bob | 25 | Japan | Pro | 10 | USD |
| Bob | 25 | Japan | Free | 0 | INR |
| Bob | 25 | Japan | Enterprise | 50 | JPY |

## Remove a row or column

1. In the left navigation, open **Data Sets**, then open the data set.

2. Hover over the row, or over the column header.

3. Click the ellipsis icon (⋯) at the start of the row or column.

4. Click **Remove Row** or **Remove Column**.