To make it easy for sales associates to learn what promotions are applicable to a selected line, or even to the whole cart, retailers can add the button for the "View available discounts" operation to the button grid on the Transaction page. As a result, sales associate can select a transaction line and then select the button to show all the discounts that are available for the selected line.
This functionality also exists on e-commerce.
It would be great to add this feature also on call center sales orders so the customer service representatives are able to advise the customer on the available promotions.