After you have finished entering components, press <Esc> once or <Enter> twice on a blank line number. The program will sum up the costs of the components and suggest a selling price based on the cost and the markup factor entered in the major class code screen.
The program will add or subract the value of the changes made to the finished item and add or subtract that vale from the cost of the item, allowing you to change the overall cost, if you want.