Product is on sale or special
If you wish to reduce the price of a product by way of a sale or special on that item - then the method is to just reduct the product price below the RRP.
Open the product record - and look at the profile of the product under the Info panel.
Scan down to the price information and reduce your price below the RRP field - as demonstrated below.
Remember to Save your change.
When you look at this product in the online shop. You will now see the sale price identified as shown below...