Custom attributes refer to additional fields that are defined by users or developers to meet specific requirements or preferences beyond the standard attributes provided by that application. 

Custom Attributes can be added by following the below process. 

• Login to Identity Bridge. 
• Go to Configuration Hub. 
• Go to Configure Source. 
• On the ServiceNow tile click on the edit button. 
• Click on the Attribute tab. 
• Click on the ‘Add Fields’ Button. 
• Enter the Field Name, Field Description, Field Type, Pattern, Field Size. 
• Enter Scim Name as “Custom.Given Field Name”. 
• Click on “Update” Button. 

Note: This will create a new Group Attribute “Custom”.