When we do the Sunnah Salat before the Fard (eg. 4 before Zuhr), do we have to say Surahs after the Surah 'Fatihah' and if we do, do we do it for every Rak'ah.

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions. It is Sunnah to recite a Surah with Al-Fatihah in the first two Raka'as of the four and three Raka'a prayers as well as in Fajr and the Nawafil (supererogatory prayers). Allah knows best.