Private Sub LB_02_Click()
Dim sn, i As Long, c00 As String
sn = Sheets("Invoer Gegevens").Cells(2).CurrentRegion
For i = 2 To UBound(sn)
If sn(i, 2) = LB_02.Column(0) Then c00 = c00 & "|" & i
Next
If c00 <> "" Then
LB_03.List = Application.Index(sn, Application.Transpose(Split(0 & c00, "|")), Split("1|2|3|4", "|"))
Else
LB_03.Clear
End If
End Sub