how to add fields such as Customer prompt payment discount and Amount of Discount, I plan to add fields for service tax Art 23 (Withholding Tax PPh Art 23/26).

so when recording customer acceptance from "Sales -> Customer Payments", the service tax (Withholding Tax PPh. 23/26) is automatically journalized.

Cash / Bank Account                       IDR 251,828,885
Withholding Tax PPh Art 23/26         IDR     5,139,365
                           A / R                                             IDR 256,968,250

Attc. https://ibb.co/j4LYqfX

thank you