Populate Listview Subitems Of Selected Items

I have a multiline textbox in which i add values to.A button is pressed to put these values in a listview in the first column.I then have 5 or 6 other comboboxes and textboxes that will send information as subitems to the listview, only if the original item in the listview has a checked box. The code i currently have is just adding the subitems to however many checkboxes are checked.I am trying to get the subitems to add to all of the items that have checked boxes rather than creating there own rown underneath the checked boxes.[code]