Sub DeleteSubLevels()
Dim lastRow As Long
Application.ScreenUpdating = False
With ActiveSheet
lastRow = .Cells(.Rows.Count, "B").End(xlUp).Row
.Range("B10:B" & lastRow).AutoFilter field:=1, Criteria1:=">1"
On Error Resume Next
.Range("B11:B" & lastRow).EntireRow.SpecialCells(xlCellTypeVisible).Delete
On Error GoTo 0
.AutoFilterMode = False
End With
Application.ScreenUpdating = True
End Sub