Easy POS Docs - Pricing & Discounts
Discounts (Pricing Rules)

A dedicated admin screen (list + editor) for ERPNext Pricing Rules: percentage discounts, flat-amount discounts, and free-item ("Buy X Get Y") rules — scoped by item/item group/brand, customer/customer group, min/max qty or amount, priority, and validity dates. These apply automatically to the cart, on top of any manual per-cart override a cashier makes.
Item Prices

A dedicated list + editor for individual Item Price records (item, price list, rate, currency, valid-from/upto) used to price cart lines.
Price Lists

Manage the Price List records themselves (selling/buying, currency, enabled state) that Item Prices and the cart price against, independent of discount rules.