I am trying to insert additional logic here ******

Sub HiLite()
For Each cll In Range("A:A")
If cll.Value = "C" Or cll.Value = "c" Then

If IsEmpty(cll.Offset(0, 1)) Then cll.Offset(0, 1).Interior.ColorIndex = 6 _
Else: cll.Offset(0, 1).Interior.ColorIndex = xlNone
If IsEmpty(cll.Offset(0, 2)) Then cll.Offset(0, 2).Interior.ColorIndex = 6 _
Else: cll.Offset(0, 2).Interior.ColorIndex = xlNone

***** If cells R - U are ALL empty, then high-light. R - U; if ONE of them
is NOT empty then NONE of the cells are high-lighted *********
End If
Next
End Sub

Thanks for any help!!