Korrigiert auf Mehrfachtreffer!
Sub Löschen()
Application.ScreenUpdating = False
Dim ZeileA As Long, ZeileB As Long
For ZeileB = 2 To ActiveSheet.Range(Cells(Rows.Count, 2), Cells(Rows.Count, 2)).End(xlUp).Row
For ZeileA = ActiveSheet.Range(Cells(Rows.Count, 1), Cells(Rows.Count, 1)).End(xlUp).Row To 2 Step -1
If InStr(1, Range("B" & ZeileB), "/") - 1 > 0 Then
If InStr(1, Range("A" & ZeileA), Mid(Range("B" & ZeileB), 1, InStr(1, Range("B" & ZeileB), "/") - 1)) > 0 Then Range("A" & ZeileA).Delete Shift:=xlUp
End If
Next ZeileA
Next ZeileB
Application.ScreenUpdating = True
End Sub