If I get another person to say that keeping the order is more important, i'll chuck it into the actual snippet. Should be obvious which part to substitute for the following code.

;If the delete channel button is clicked, delete the current channel in the combo box from the Settings.ini file
if ($did == 52) {
  if ($did($dname, 45) != $null) {
    set %channels $rs(%tab.scd01, Channels)
    set %n $did($dname, 45).sel
    dec %n
    $rms(%tab.scd01, Room $+ %n)
    did -d scd01 45 $did($dname, 45).sel
    dec %channels
    set %s %n
    while (%n < %channels) {
      inc %s
      writeini Settings.ini Server $+ %tab.scd01 Room $+ %n $rs(%tab.scd01, Room $+ %s)
      inc %n
    }
    $rms(%tab.scd01, Room $+ %n)
    unset %s
    writeini Settings.ini Server $+ %tab.scd01 Channels %channels
    unset %channels
    unset %n
  }
}