It will update patient balance as copay amount in transaction for the entered patient and for transactions in entered date range.
Navigate to Specific Activities >> Copy Patient Balance to Patient Copay
Enter start date, end date for transactions and the patients whose copay has to be updated.
If Override copay amount is set to "No" then copay amount will be updated only if it is "0" in transaction. If "Yes" is selected copay amount will be updated for entered criteria irrespective of the copay value in transactions.