Q. In a minyan where they usually make some hosofos (calling additional persons to the reading of the Torah during Shabbos), there is a constant debate between the attendants if you can do the same when one reads from three Sefer Torahs as in this week’s parsha. What is correct?
A. Aruch Hashulchan (684: 4) maintains that no hosafos should be added on the first Sefer Torah, when three seforim are read.
However, Mishna Berura (ibid. 9) disagrees and permits when it is usually done on other Shabbosos.
Horav Shlomo Miller’s opinion is also to be lenient.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a