Explanation:

Profit & Loss Account-
Carriage inwards is connected with the cost of getting goods into the business and ready for sale. As a result, it will be added on in the calculation for the cost of goods sold. Carriage outwards does not have anything to do with the cost of getting goods into saleable condition. Therefore it will appear with all the other overhead expenses and the profit and loss account.

Carriage inwards -Trading account expense
Carriage outwards -Profit & loss account expense