Configuration item field should reference the CI table showing all CI classes excluding Service

[Sakshi Lambat]

Requirement is like,  the Configuration item field should reference the CI table showing all CI classes excluding Business Service. How to achieve this? Can anyone help me out in this?

[Dr Atul G- LNG]

@Sakshi Lambat 

https://www.servicenow.com/community/developer-forum/how-to-exclude-business-service-class-from-conf...

https://www.servicenow.com/community/developer-forum/exclude-a-cmdb-class-from-configuration-item-fi...