Hello Clint:
When you are working on an Order and viewing the list of items on that Order, you can control the columns that appear. You can show columns for extended cost and extended price for each item. Unfortunately you cannot add a column that shows the margin. The reason is that only columns that exist in the underlying data table can be shown. The extended cost and selling price fields are there but margin is always a calculated figure; it does not exist in the data table.