What Is Sunnah ?
Yes, since sunnah consists of practice of the Prophets of God, therefore it is prior to the Quran in that perspective . It was purified by the last prophet, Prophet Muhammad SAW, and established as an independent source of religion in addition to the Quran. For further details, please see: Discussion 880 and Discussion 79364
In addition to following the 23 Response Series link shared above by Faisal Sahab, please also refer to the following response which covers the topic of Sunnah comprehensively : Discussion 50126 • Reply 50134