Yes, he can certainly make a filesystem on another partition, mount it
temporarily, move the contents of /home to the new partition and then
mount the new partition on /home as you indicate below - but if and only
if there is actually another partition to move home to.

Otherwise the hints above won't do him any good, so the first step is to
determine whether there is in fact another, unused partition that he can
use for home.

Since he indicated that he is loath to use the command line, it would
have been much easier if he had told the ubuntu installer to create a
separate partition for /home at the outset.