There are 3-4 opinions quoted in MB. See OC 135:2 in Rama, and the various people below.
One is that you have to do them all. Another is that you don’t go back more than the begining of the current Chumash, which would mean back to Vayikra, because you only do multiple parshiyos if you can overlap the gap with a single aliya, and you can’t have a single aliya cross over between Pikudei and Vayikra. And one opinion is to only make up one week, like tefilas tashlumin for Shmoneh Esreh, that you can only make up the last one. That shitah has two variations, either to do just plain one extra week. The other version is to do no more than 2 parshiyios on one Shabbos no matter what. That means if either the week you resume, or the week you are trying to make up has 2 scheduled parshiyios, there would not be any makeup, because that would require 3. At this time that would mean that if we’re back in business by Shmini, so we’d do Tzav and Shmini. But if it takes longer, three of the following four weeks are double parshiyos, so there would be no makeup at all. Unless it drags out all the way until Naso, then you could do BAmidbar and NAso. By that time we’ll be off from Israel beacuse the second day of Shavuos, they’ll be laining NAso in Israel, which we won’t get to until the following week. Oy it’s complicated. I’ve seen that Rabbi Heinemann has been machria to do them all whenever we get back to normal.
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