**Data Modeling Hub > Events > Add event**.
3. In the **Name** field, enter `product.LowInStock`
In the API and SDK, the name parameter is usually called `action` or `action name`
4. Optionally, define a human-friendly display name that will be shown in **Data Modeling Hub** and **Decision Hub Hub**.
5. Optionally, in the **Description** field, enter the description of the event.
6. Enable the **Make this event available to anonymous profiles without JWT** toggle.
7. Click **Apply**.
8. In the list of events, find the event you just created.
9. On the right side of the screen, click **Add property**.
10. In the **Source parameter** field, enter `lowstock_cart`.
This parameter will be used to save the SKUs of items which are low in stock.
11. In the **Property name** field, enter a human-readable label of the property for display in the Synerise platform.
12. Optionally, in the **Description** field, you can add an explanation about the purpose of this parameter.
13. To complete the process, click **Save**.
## Create an aggregate that returns the products in a cart
---
This aggregate will be used later in the **product.LowInStock** event to get products a customer added to their cart.
1. Go to 
**Behavioral Data Hub > Live Aggregates > Create aggregate**.
2. As the aggregate type, select **Profile**.
2. Enter the name of the aggregate.
3. Click **Analyze profiles by** and select **Last**.
4. From the **Choose event** dropdown list, select the `cart.status` event.
5. As the event parameter, select **ItemIds**.
6. Set the period from which the aggregate will analyze the results. In our case, we set the time period to **Lifetime**.
7. Save the aggregate.
**Behavioral Data Hub > Live Aggregates > Create aggregate**.
2. As the aggregate type, select **Profile**.
2. Enter the name of the aggregate.
3. Click **Analyze profiles by** and select **Last**.
5. From the **Choose event** dropdown list, select the `cart.status` event.
6. As the event parameter, select **totalQuantity**.
7. Set the period from which the aggregate will analyze the results to **Lifetime**.
12. Save the aggregate.
{
"lowstock_cart":
"{% set skus = [] %}
{% aggregate PRODUCTS-IN-CART %} {# replace PRODUCTS-IN-CART with the ID of the aggregate that returns products in the cart #}
{% for items in aggregate_result %}
{% do skus.append(items) %}
{%endfor%}
{% endaggregate %}
{% set lowstock = []%}
{% for sku in skus %}
{% catalogitemv2.CATALOG-NAME(sku) %} {# replace CATALOG-NAME with the name of your feed catalog #}
{% set object = catalog_result %}
{% if object.get('Quantity')|int < NUMBER %} {# NUMBER defines the amount of products you consider as low in stock #}
{% set quantity = object.get('Quantity') %}
{% do lowstock.append(sku) %}
{%else%}
{%endif%}
{% endcatalogitemv2 %}
{%endfor%}
{% if lowstock|count==0 %}0{% else %}{{lowstock[0]}}{% endif %}"
}
