Select the cell with the person's name
Ctrl-A to select the entire text
Press <delete>
Scroll down to the bottom of the list
Enter the person's name in column A ("Name (Last,First)") in the first blank row
Identify the primary person in the group and enter their name in column A ("Name (Last,First)")
For each person in the group enter their name in column A and identify the primary person in the group in column B ("Comes/Sits With")
Note: It is possible for a group to be listed many times in the attendance checklist. For instance, Tracy Hanna may be the primary person in one such group and Brian Smith the primary person in the second grouping. The first group will appear in the attendance checklist under "Hanna" and the same group will appear in the checklist under "Smith".
Pulldown the Dropdown Script Menu and select "Sort by Group". The list will be ordered by the primary person and any folks who sit with them will appear in the list below the primary person.