> ## Documentation Index
> Fetch the complete documentation index at: https://docs.zeotap.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Add a Product Category

The Product category stores product transaction information at a user level. Perform the following steps to add a Product category:

<Steps>
  <Step>
    Enter a Catalogue Field. As you type, suggestions based on the existing Catalogue Fields appear. You can choose a suggested Catalogue Field or click **+Add Catalogue Field** to add a new field.
  </Step>

  <Step>
    Map the Catalogue Field to its corresponding Source Field. Same as the above behaviour, you can choose a suggested Source Field or click **+Add a new Source Field** to add a new field.
  </Step>

  <Step>
    Enter a description for easy identification.
  </Step>

  <Step>
    Choose one of the following as the **Data Type**:

    * String
    * Integer
    * Double
    * Timestamp
    * List of String/Integer/Double

    <Note>
      **Note**

      Ensure that you consider the following points while selecting the `List` Data Type:

      * You can map both `List` and single-value source fields to the `List` type catalogue field. Therefore, when a single value source field comes into the system for this Category, then the new data is upserted on the existing data without overwriting it. For example, if the source field is a single value field like "Product Name" and it is mapped to `ProdName` field of the data type `List` in the Catalogue, then any new value that comes into the system for the product name appends to the existing data in the format, \{p1, p2, p3...}, preserving the previous entries.
      * You can only map a source field of the data type `List` to a catalogue field of the data type List. For example, if the source field is of type `List of String`, then you can map it to only List type attributes in the Catalogue field drop-down of the source mapping screen. 
      * When sharing source data containing `List` type information, ensure that you use the correct format and  avoid null values. Otherwise, it might lead to mapping issues or data being dropped during the data ingestion process.
    </Note>
  </Step>

  <Step>
    Choose **Product** as the **Category**.
  </Step>

  <Step>
    Under advanced settings, a Group Name appears by default. You can choose a value from the drop-down menu or click **+Add a new group** to add a new group name.
  </Step>

  <Step>
    Save the changes.

    <Frame>
      <img src="https://mintcdn.com/zeotap/htBST1bc1LEJ85Nd/articles/unify-customer/Storage/unify-customer/unify/prod_cat.png?fit=max&auto=format&n=htBST1bc1LEJ85Nd&q=85&s=6cbd45cdac0368a96a940ccb2b0b7bb6" alt="" width="3564" height="1994" data-path="articles/unify-customer/Storage/unify-customer/unify/prod_cat.png" />
    </Frame>
  </Step>
</Steps>