need to add the related object custom fields

Summary:

need to add the related object custom fields on the parent object it order to include it as a search criteria

Content (please ensure you mask any confidential information):

The requirement is to create a child custom object (CO) for the contact standard object that includes an address field/s with specific information and layout. This address should be usable for appointments, allowing searches for contacts using the custom field in that child CO.

Version (include the version you are using, if applicable):

Oracle service cloud

Code Snippet (add any code snippets that support your topic, if applicable):