A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Right-click on the sheet tab and "View Code"
Copy/paste the event code into that module.
Edit to suit then Alt + q to return to the sheet.
Select a cell to place X, select it again to remove X
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Target.Count > 1 Then Exit Sub
If Not Intersect(Target, Range("A1:A10")) Is Nothing Then
If ActiveCell.Value = "X" Then
ActiveCell.Value = ""
Else
ActiveCell.Value = "X"
End If
End If
End Sub
Gord