To access the pricing page, navigate to Catalog>Manage products. Select the product you want to manage, and click on Pricing>Pricing
Fill in the desired fields:
Old price: If a price has been reduced (or you want to prove that it has changed), an amount can be entered at Old price. This amount will then be shown as crossed out above the current price.
Price: Here you can enter the current price that the visitor will see for the product, the shopping cart and the invoice, among other things.
Special Price: Fill in a price that is temporary in nature (such as a promotional week). This price is the current price. If the price is to be valid for a certain period of time, you'll need to fill in the start and end date under this field.
Product cost: Here you can set the purchase costs. This only needs to be set up for possible reports on the turnover of products.