The extra souls level of Ruach that is available on Shabbat comes from Chokmah and Binah to Zeir Anpin. It is the aspect of the River that comes out of Eden. It reaches the sixth Sefira, Yessod, the aspect of Tzadik and from there water the Garden that is Malchut and the extra soul level of Nefesh.
The soul level of Neshama that governs the servant of God during the weekdays comes from the Holy Throne that is in the world of Creation, Briah. The level of Ruach on weekdays is coming through Metatron from the world of Formation, Yetzirah that is the six sefirot of Zeir Anpin.
The soul level of Nefesh on the weekdays has the aspect of judgment and from the world of Action, Asiyah, controlled by the angel Sandal—.
The Nefesh level of a Torah scholar is called “daughter of the King”, Malchut. It has the aspect of מצה שמורה Reserved Matzah that we eat at the night of the Passover Seder. The Ruach level is the aspect of the the holiday that is Zeir Anpin. Both have the aspect of Shabbat, the night of Seder and the night of Shabbat because the Nefesh is from the world Emanation, Atziluth, revealed in Malchut.
The study of Torah bestows on us extra and higher levels of souls.