diff --git a/MainWindow.axaml b/MainWindow.axaml
index 659eed5..f9efbef 100644
--- a/MainWindow.axaml
+++ b/MainWindow.axaml
@@ -220,14 +220,18 @@
                                             </StackPanel>
                                             <Label FontSize="9" Content="Nur Elemente, die NICHT doppelt sind" />
                                         </StackPanel>
-
                                     </Button>
                                 </StackPanel>
-                                <StackPanel Orientation="Vertical" HorizontalAlignment="Center">
-                                    <RadioButton Content="Vergleiche nach refsid" IsChecked="True" x:Name="RbComprefsid"></RadioButton>
-                                    <RadioButton Content="Vergleiche nach finaler Adresse" IsChecked="False" x:Name="RbCompfinAd"></RadioButton>
+                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" Spacing="50">
+                                    <StackPanel Orientation="Vertical" >
+                                        <RadioButton Content="Vergleiche nach refsid" IsChecked="True" x:Name="RbComprefsid"></RadioButton>
+                                        <RadioButton Content="Vergleiche nach finaler Adresse" IsChecked="False" x:Name="RbCompfinAd"></RadioButton>
+                                    </StackPanel>
+                                    <StackPanel Orientation="Vertical">
+                                        <CheckBox HorizontalAlignment="Left" x:Name="CbMergeExportUnmerged" IsChecked="False">Speichere Unverarbeitete in neuem Verteiler</CheckBox>
+                                        <CheckBox HorizontalAlignment="Left" x:Name="CbMergeDeleteOld" IsChecked="False">Lösche ursprüngliche Sets</CheckBox>
+                                    </StackPanel>
                                 </StackPanel>
-                                <CheckBox HorizontalAlignment="Center" x:Name="CbMergeExportUnmerged" IsChecked="False">Speichere Unverarbeitete in neuem Verteiler</CheckBox>
                             </StackPanel>
                         </Grid>
                         <Grid Grid.Row="2" Margin="20" ColumnDefinitions="*,5*,*" IsVisible="False" x:Name="GrdExportMarginOptions">
diff --git a/MainWindow.axaml.cs b/MainWindow.axaml.cs
index 6959495..6757d21 100644
--- a/MainWindow.axaml.cs
+++ b/MainWindow.axaml.cs
@@ -391,7 +391,7 @@ public partial class MainWindow : Window
         progressWindow.Show(_instance);
 
         var processor = new CombineAddresses(progressWindow);
-        var result = await processor.Perform(address_lists, type, comb_type, CbMergeExportUnmerged.IsChecked);
+        var result = await processor.Perform(address_lists, type, comb_type, CbMergeExportUnmerged.IsChecked, CbMergeDeleteOld.IsChecked);
 
         if (result.Item1 != null)
             result.Item1.owner_id = owner_id;
diff --git a/Tasks/CombineAddresses.cs b/Tasks/CombineAddresses.cs
index 1a7c861..0ac8aa8 100644
--- a/Tasks/CombineAddresses.cs
+++ b/Tasks/CombineAddresses.cs
@@ -24,13 +24,29 @@ public class CombineAddresses
     }
 
     public async Task<(KasAddressList, KasAddressList)> Perform(List<KasAddressList> address_lists, string type, CombineType comb_type,
+        bool? exportUnused, bool? deleteOld)
+    {
+        var result = await Execute(address_lists,type,comb_type,exportUnused);
+
+        if (deleteOld == true)
+        {
+            foreach (var list in address_lists)
+            {
+                Settings._instance.addressSets.addresses.Remove(list);
+            }
+        }
+
+        return result;
+
+    }
+
+    private async Task<(KasAddressList, KasAddressList)> Execute(List<KasAddressList> address_lists, string type, CombineType comb_type,
         bool? exportUnused)
     {
         if (type == "difference") return await Difference(address_lists, comb_type, exportUnused);
         if (type == "union") return await Union(address_lists, comb_type, exportUnused);
         if (type == "intersection") return await Intersection(address_lists, comb_type, exportUnused);
         if (type == "symdiff") return await SymmetricDifference(address_lists, comb_type, exportUnused);
-
         return (null, null);
     }