Create INSTEAD OF INSERT trigger. Here is script
CREATE TRIGGER CHArraa ON film
INSTEAD OF INSERT
AS
BEGIN
SET NOCOUNT ON
INSERT INTO dbo.film
SELECT
special_features,
CASE WHEN special_features = 'Trailers' THEN rental_rate + 0.10
WHEN special_features = 'Commentaries' THEN rental_rate+ 0.50
WHEN special_features = 'Deleted Scenes' THEN rental_rate + 0.20
WHEN special_features = 'Behind the Scenes' THEN rental_rate - 0.20
END AS rental_rate
FROM INSERTED
END