---
sourceDocument: Australia ServiceNow AI Platform Administration
sourceDocumentLink: https://www.servicenow.com/docs/r/platform-administration

 Release :

    - australia

ft:locale :

    - en-US

ft:publication_title :

    - Australia ServiceNow AI Platform Administration

ft:clusterId :

    - platadm

bundleId :

    - platadm

workflow :

    - Platform


---

# Create many-to-many table relationship

# Create a many-to-many table relationship {#t_CreateAManyToManyRelationship__CreatingAManyToManyRelationship}

* Release version: Australia
* 
* Updated March 12, 2026
* 
* ![](https://www.servicenow.com/docs/portal-asset/ico-clock) 1 minute to read

Create a bi-directional relationship between two tables, so that the related records are visible from both tables in a related list.

## Before you begin

Role required: admin.

## About this task

Many-to-many relationships allow a list to point to a list of entries, rather than to single field.

If a knowledge base article points to a list of related configuration items, it uses a related list. Not all lists can be used as related lists, however. For a list to be related to another list, a many-to-many relationship that
refers to both tables must exist.

The Many to Many Definitions `[sys_m2m]` table allows administrators to create custom many-to-many relationships.

Many-to-Many tables aren't considered custom tables and don't count toward your custom table allotment.

## Procedure

1. In the navigation filter, enter <kbd class="ph userinput">sys_m2m.list</kbd>.
2. Click New.
3. In the From table field, specify a parent table.
4. In the To table field, specify a child table.  
   The Many-to-Many form automatically populates the other fields with suggested values.
5. **Optional:** Edit other field values, if appropriate.  
   Note:  
   Many-to-Many table names cannot exceed 30 characters.
* **[Reference default many-to-many relationships](https://www.servicenow.com/docs/dkeK9pAeU_iSOGgN5N8aKQ)**   
  Some many-to-many relationships are defined by default.

**Related reference**   

* [Reference default many-to-many relationships](https://www.servicenow.com/docs/dkeK9pAeU_iSOGgN5N8aKQ "Some many-to-many relationships are defined by default.")