Is the Witr prayer, performed in conjunction with the Tarawih prayer, and followed by a prayer later in the night, considered a supererogatory (nafilah) prayer and not Qiyam al-Layl?

If you wake up in the last part of the night for Tahajjud, do not pray Witr with the Imam after Taraweeh. Instead, after the Imam finishes Witr, add one unit (rak'ah) to make your last prayer Witr, and you will achieve the reward of a complete night's prayer. If you have already prayed Witr and then prayed Tahajjud, do not repeat Witr, for the Prophet (peace be upon him) said: "There are not two Witr prayers in one night."