Mark Request as Non-Billable
You can make use of Business Rules to set the Criteria as "Request Type is" (or any Criteria as per yours) and under Actions set "Mark Request as Non-Billable". So once the Request is marked as Non-Billable, the worklog added under that request will also be set as Non-billable by default.
NOTE: The Business Rule will be applicable for the Accounts which are enabled with Contract Billing and not for other Accounts :
New to ADSelfService Plus?