On the page Sales Price Rules, New is selected to create a new rule.

The following fields are required:
Code – enter code rule
Description – enter description rule
Price According – choose whether the prices will apply to the Bill-to Customer or the Sell-to Customer specified in the sales order. The default value is Bill-to Customer.

Discount According – choose whether the discounts will apply to the Bill-to Customer or the Sell-to Customer specified in the sales order. The default value is Bill-to Customer.
Prices Only From Price List – the field takes the values Yes /No. The default value is No.
No - the field is not checked, then if the selling price is not found in the price lists, the items from the field Unit Price will be taken from the card.Yes - the field is checked, sales prices are found only in the price lists, if the price is not found in the price lists, the items from the Unit Price field are not taken from the card.