Editing listview

I have a listview with 3 items (red, green, blue) and 3 subitems (true, true, true) i.e., red = true, green=true, blue=true. I know how to delete an item completely from the listview, but is there a simple way to edit a subitem. I want to be able to change the selected value to false.

I found a lot of stuff doing a search of the forums. Is is best just to delete the entry and then add it back with the new value?