To do this task
Go to the Customers menu and click Change Item Prices.
Choose the Item Type of the items
requiring a price adjustment.
In the column,
click the items for which you want to adjust the price; or, click Select All to select all the items.
In the Adjust price area, enter a number followed
by the % sign.
Sales Price or select Unit Cost
to choose the base price to which the amount will be calculated.
Where are prices
Changing prices by a