MB4 203a: Carrying Less than Four Amos in a Public Domain on Shabbos (349:3-5)

Asking a non-Jew to carry a Sefer Torah from a karmelit to a Reshut HaYachid on Shabbos.

Two or three people stuck in Reshut HaRabim on Shabbos with overlapping 4 amot areas.

Carrying an item in reshut harabim or a karmelit less than 4 amot at a time. When permissible, what is the procedure for carrying less than four amot at a time?