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)