Besides the Mishna Berurah (Orach Chaim) for ashkenazim and the Kaf Hahaim (Orah Chaim and parts of Yoreh Deah) for Sefardim, what is used to complete the scope of Shulchan Aruch ?
(See also here.)
I am told that the custom in Israel is to use the sefer Beis Dovid for these halachos, but I have never seen this brought down inside anywhere.
The ba'er heiteiv of course! Written by different authors for different chalakim of shulchan aruch, but long held as authorotive. In fact Rav Shamshon Rafael Hirsch mentioned this work as binding for all jews to learn along with shulchan aruch. Of course latter works have been accepted in orach chayim but none have replaced it on the other chalakim.
For Sefarad, Shulchan Aruch of the Beis Yosef. Ashkenaz use either Rama or Mishna Berurah. The Tur also covers this topic. (Shulchan aruch harav a.k.a Alter Rebbe m'Lubavitch shulchan aruch covers hilchos nida in depth). For Sefardim, the Beis Yosef covers pretty much everything there is to know. As for chassidim (mainly Chabad) the Alter Rebbe covers Chosen Mishpat in depth.