신명기 33:27의 Halakhah

In the daytime, after the Hakafos, three Sifrei Torah are left out, and many people are called up to one Seifer Torah, to read the portion Vezos haberachah up to Me'onah (Deut. 33:27) repeating it many times. At the end, all the young boys are called up. It is proper that a boy who is bar mitzvah should say the berachah and that the others should listen.⁴They will be exempt with his berachah. The verse Hamalach hagoel is read for them⁵According to Levush this verse is recited over them as an oral blessing, but it is not read. (Ibid 669:14) [The angel who delivered me] etc. (Genesis 48:16). After that, the Chasan Torah is called up and he reads from Me'onah to the end [of the Torah]. In the second Seifer Torah, the Chasan Bereishis reads. Then half-kaddish is said. In the third Seifer Torah, Maftir is read. (see chapter 79:1 above) It is the custom in many communities to be mindful to call up an eminent person for Chasan Torah. Even a person who was called up already for the reading of Vezos haberachah, may still be called up as Chasan Torah or as Chasan Bereishis. Where there are only two Sifrei Torah, Vezos haberachah should be read in one, and Bereishis in the other one, and the first seifer is taken again for Maftir.