A customer can buy multiple products and request different SLAs and support plans for each product. 

We can enter different support plans and define the credit. 

The scenario I want to happen;

- To reduce the credits in the defined support plans according to the “Billing Type” in the “TimeEntry” in the ticket. 

Because each ticket opened by the customer may not be charged. And it may not be deducted from the credit. It would be much wiser to leave this to the agent's choice.