Breaking the 4 rak’aats of Zuhr sunnats

Question: If a person breaks the 4 rak’aat sunnat of Zuhr before 2 rak’aats does he repeat only 2?

Answer: No, he will have to repeat the entire 4 if he broke the 4 sunnats of Zuhr, irrespective whether it is before the tahiyyah or after.