Hi guys, I have a list view which has numbers in subitems(3)

now how can I make it so when Command1 is pressed it will sort by highest Value first. at the moment when I sort it it sorts by the first number not the entire value.

For example

99000
9
9
9
8
8
8
80000


I'd like it in order like

99000
80000
9
9
9
8
8
8