Hide a many checkboxes when the column is hidden

Place you number in cell "AB1" and alter the code in RED as below:-

Set cl = Sheets("Project Cost").Range("$AC$1")
If cl.Offset(, -1).Value = "1" Then
    cl.Resize(, 3).EntireColumn.Hidden = True
Else
    cl.Resize(, 3).EntireColumn.Hidden = False
End If