Siman 295
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א הַגָּה: וְאוֹמְרִים וִיהִי נֹעַם וְסֵדֶר קְדֻשָּׁה בַּאֲרִיכוּת, כְּדֵי לְאַחֵר סֵדֶר קְדֻשָּׁה שֶׁאָז חוֹזְרִים רְשָׁעִים לַגֵּיהִנֹּם (טוּר). וּבִזְמַן שֶׁאֵין אוֹמְרִים וִיהִי נֹעַם, כְּגוֹן שֶׁחָל יוֹם טוֹב בַּשָּׁבוּעַ, אֵין אוֹמְרִים סֵדֶר קְדֻשָּׁה אֲבָל אוֹמְרִים וְיִתֶּן לְךָ (כָּל בּוֹ). מַבְדִּיל שְׁלִיחַ צִבּוּר כְּדֵי לְהוֹצִיא מִי שֶׁאֵין לוֹ יַיִן. הַגָּה: וְנָהֲגוּ לוֹמַר וּלְהַזְכִּיר אֵלִיָּהוּ הַנָּבִיא בְּמוֹצָאֵי שַׁבָּת, לְהִתְפַּלֵּל שֶׁיָּבֹא וִיבַשְּׂרֶנּוּ הַגְּאֻלָּה (טוּר).
1 The Havdalah Recited by the Sheliach Tzibbur. Rema: And we say ויהי נועם and afterwards it is customary to recite the Order of Kedushah in order that the Jewish people will delay the completion of their prayers, in order to delay the return of the wicked to Gehinnom [after their Shabbos respite] (Tur). At a time when we do not say ויהי נועם, like when a Yom Tov falls during the week, we do not say the order of Kedushah, but we do say ויתן לך (Kol Bo). The prayer leader says Havdalah in order that those who do not have wine may fulfill their obligation. Rema: And it is our custom to say and to remember Elijah the Prophet on Motzaei Shabbos, to pray that he will come and announce the redemption. (Tur)