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# Horizontal relationships

# Horizontal relationships between products {#ariaid-title1}

* Freigeben Version: Australia
* 
* Aktualisiert 12. März 2026
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 Minute Lesedauer

By using a compatibility rule, you can define the horizontal relationships between your product, service, and resource specifications.
When you create a product catalog, you can create a vertical relationship, which is the relationship between your parent and child entities. As a product catalog manager, you can also enable a horizontal relationship, which is a
relationship between a product to product, product to service, or product to resource, by defining compatibility rules in the product catalog.

## Using a horizontal relationship {#horizontal-relationships__section_oz2_cvs_25b}

The compatibility rules include the horizontal relationships between your product, service, and resource specifications. Your customers can place orders for enterprise products where a product can depend on another product in
the same or different product offering, like a sibling or a peer.

Let's look at an example of a horizontal relationship, such as the relationship between the Voice over Internet Protocol (VoIP) and an internet service. VoIP requires an active internet connection but VoIP and an internet
service are defined in a different product hierarchy. With a horizontal relationship, you can define a relationship between VoIP and an internet service in the product catalog to support the order creation process for VoIP and
to fulfill the order.