# Rule action: Build item group

* Create a list of values, such as brands or colors, from your items based on a group ID.

Use the **Build item group** action to create lists based on a grouping identifier, such as `item_group_id`. For example, you can create a list using values from specific fields.

<figure><img src="/files/9a806293347d2291b8025b454cfba6ae05729b37" alt=""><figcaption></figcaption></figure>

Let's say we have data for items of different brands and colors, and we want to create lists for all the brands and colors.

| id | item\_group\_id | brand       | color  | brand\_list | color\_list |
| -- | --------------- | ----------- | ------ | ----------- | ----------- |
| 1  | 1               | Nike        | White  |             |             |
| 2  | 1               | Adidas      | Purple |             |             |
| 3  | 1               | Puma        | Yellow |             |             |
| 4  | 2               | New Balance | Beige  |             |             |
| 5  | 2               | Vans        | Black  |             |             |
| 6  | 3               | Crocs       | Green  |             |             |

If you use the **Build item group** action and use the `brand` and `color` fields, the result will be a complete list of brands and a list of colors.

| id | item\_group\_id | brand       | color  | brand\_list        | color\_list           |
| -- | --------------- | ----------- | ------ | ------------------ | --------------------- |
| 1  | 1               | Nike        | White  | Nike, Adidas, Puma | White, Purple, Yellow |
| 2  | 1               | Adidas      | Purple | Nike, Adidas, Puma | White, Purple, Yellow |
| 3  | 1               | Puma        | Yellow | Nike, Adidas, Puma | White, Purple, Yellow |
| 4  | 2               | New Balance | Beige  | New Balance, Vans  | Beige, Black          |
| 5  | 2               | Vans        | Black  | New Balance, Vans  | Beige, Black          |
| 6  | 3               | Crocs       | Green  | Crocs              | Green                 |


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