The Target Profit Margin field is used to calculate the cost of items that have a $0.00 Base Price and Cost based on the price entered on the Sales Transaction.
When the Price is entered at the time the item is sold, Keystroke calculates the Cost using the Target Profit Margin.
Example #1:
If the item's Target Profit Margin is set to 50 (50%) and the item is sold for $5.00, the cost is automatically calculated at $2.50.
Example #2:
If the item's Target Profit Margin is set to 0 (0%), as it might be for Service/Labor items, and the item is sold for $100.00, the cost is automatically calculated at $100.00.
See:
Inventory Database - Order Data Screen Fields