03 Billing Details - Calculations
Billing Details are shown on the lower left corner of the order list from the Sales Order module.

Sub Total Displays total of items' Selling Price
VATable Selling Price minus (Selling Price / 1.12)
12 % VAT Selling Price / 1.12
Discount Applied item discounts or global discount.
Terminal # Terminal number of POS
Cashier Current Cashier User
VAT Exempt Not VATable Sales