The Orders setting controls the inclusion of overage charges in a Make Sale.
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Under Business Rules > Local Services > CostGuardService > ServerName_CostGuardServer > Customer Management Settings, double-click Orders.

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Check Auto Generate Overage Bill Payment at Make Sale. The system calculates any overage charges and includes the charges on the customer's next sale (including auto-renew). It also creates a report of customers and services having an Overage Amount Balance.