> For the complete documentation index, see [llms.txt](https://docs.rmhpos.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rmhpos.com/store-manager/manage-inventory/update-on-hand-quantities-with-parent-child-relationships/setting-up-parent-child-relationships.md).

# Configure parent-child relationships between items

Parent items contain a set quantity of child items, e.g., a case (parent item) of 24 bottles of water (child items). When the on hand quantity of the child item is zero, the parent item can be opened up to add the child items to the quantity on hand. This topic describes all steps required to set up parent-child relationships between items in RMH.

## (Optional) Configure purchase order options for child items

1. Click **Setup**.
2. Expand **Inventory/Purchasing**.
3. Click **Order Setting**.
4. Select **Child Reorder**.
5. Click **Save And Close**.

## Configure parent-child relationships between items

{% hint style="info" %}
You must add both the parent and child items to the store database before you can create a parent-child relationship between them.
{% endhint %}

1. Click **Merchandising**.
2. Click **Items**.
3. Double-click the child item to open it.
4. On the **Special** tab, do the following:
   1. Click the browse icon next to the **Parent item** field and select the parent item.
   2. In the **Child quantity** field, enter the quantity of child items within the parent item.
5. Click **Save And Close**.


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