# Null value transform function
## Introduction
The **null value** transform function is used to replace the value of a source field with null.
## Adding a null value transform
**Step 1**\
In your process flow, access settings for your map shape:
**Step 2**\
Select the **add transform** button for the required mapping rule - for example:
**Step 3**\
Click the **add transform** button:
**Step 4**\
Click in the **name** field to access a list of all available transform functions, then select **null value** from the **other** category:
**Step 5**\
Click the **add field** button:
**Step 6**\
Click in **source fields** and select the source field to be used for this transform:
**Step 7**\
Accept your changes (twice).
**Step 8**\
Save the transform. You'll notice that the transform icon is updated to indicate that a transform function is present for the mapping row - for example:
