Hello again all of you VERY helpful people! :)

I have a macro to add an "X" to certain cells using the Worksheet_Intersect
VBA function. The problem is that I would like to see only 1 "X" at a time,
but the following macro will allow for both cells (C11 and I11) to have an
"X" at the same time.

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Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target.Cells.Count 1 Then Exit Sub
If Not Intersect(Target, Range("C11,I11")) Is Nothing Then
If Target = vbNullString Then
Target = "X"
Else
Target = vbNullString
End If
End If
End Sub

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Can I add something to this where if C11 already has an "X" and they click
on either C11 or I11, it will remove the "X" from C11 and put one in I11?

Thank you!

Ronny