Integrating an IF into a Case select

Can anyone help me with something:

I am running a Private Sub Workbook_SheetSelectionChange(ByVal Sh As Object, ByVal Target As Range) and I am using the Select Case option.

Select Case (Sh.CodeName)
    Case "Sheet2", "Sheet18", "Sheet19", "Sheet20", "Sheet21", "Sheet22", "Sheet23", "Sheet24", "Sheet25", "Sheet25", "Sheet26", "Sheet27", "Sheet28", "Sheet29", "Sheet30", "Sheet31", "Sheet32", "Sheet33", "Sheet34", "Sheet35", "Sheet36", "Sheet37"
        
        Application.EnableEvents = False
        On Error GoTo NoComments
        
        For Each Cell In Cells.SpecialCells(xlCellTypeComments)
            Cell.Comment.Delete
        Next Cell


        
NoComments:

                
        For Each Cell In Target
            If Intersect(Range("B6:N12"), Cell) Is Nothing = False Or Intersect(Range("B15:N21"), Cell) Is Nothing = False Or Intersect(Range("B24:N30"), Cell) Is Nothing = False Or Intersect(Range("B33:N39"), Cell) Is Nothing = False Then
                If Cell.Value <> "" And Cell.Value <> "D/O" And Cell.Value <> "HOLS" And Cell.Value Then
                    If HasComment(Cell) = False Then
                        Cell.AddComment
                    End If
                    Cell.Comment.Text Cell.Value
                    Cell.Comment.Visible = True
                    
                End If
            End If
        Next Cell

Whilst I still want the code to run on Sheet2 but on a different range of cells. I was trying to use some sort of
IF Case = sh.Sheet2

**range code**

Else

**range code**

But it doesn't like it - I might be doing it completely wrong.
I'd appreciate any help.

Thanks

John