Nett = total sell price before tax
Landed cost = total cost incl overheads
Landed Profit = total sell price before tax – total landed cost
Nett Margin = profit % (landed profit/nett price)
Actual Cost = total costs without overheads
Actual Profit = total sell price before tax – total actual cost
Please note there are 2 different cost price fields on a PO (actual and landed)