Hallo und danke für deine Rückmeldung.
Das habe ich bisher versucht
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Private Sub Clean_old()
Dim objSelection As AcadSelectionSet
On Error Resume Next
Set objSelection = ThisDrawing.SelectionSets.Item("SS1")
If objSelection Is Nothing Then
Set objSelection = ThisDrawing.SelectionSets.Add("SS1")
Else
objSelection.Clear
End If
On Error GoTo 0
Dim startPoint(0 To 2) As Double
Dim endPoint(0 To 2) As Double
Dim pts As Variant
Dim pte As Variant
startPoint(0) = -1
startPoint(1) = -1
startPoint(2) = 0#
endPoint(0) = -1000
endPoint(1) = -1000
endPoint(2) = 0#
objSelection.Select acSelectionSetWindow, startPoint, endPoint
objSelection.Erase
ThisDrawing.Regen acAllViewports
End Sub
Es passiert aber rein gar nichts 
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