Как копировать и вставлять TreeNode?

var
   SL : TStringList;
 
 procedure TForm1.CutBtnClick(Sender: TObject);
 var
   i, j, StartLevel : integer;
   TNSel : TTreeNode;
 begin
   TNSel := TreeView1.Selected;
   if TNSel <> nil then begin
     StartLevel := TNSel.Level;
     i := TNSel.AbsoluteIndex;
     j := i; // note for later deletion
     if SL = nil then
       SL := TStringList.Create
     else
       SL.Clear;
     SL.AddObject(TNSel.Text, pointer(0));
     inc(i);
     with TreeView1 do begin
       while Items[i].Level > StartLevel do begin
         {stop before next sibling to top node\}
         SL.AddObject(Items[i].Text, pointer(Items[i].Level - StartLevel));
         inc(i);
       end; {while Items[i].Level > StartLevel\}
       Items[j].Delete;
     end; {with TreeView1\}
   end; {if TNSel <> nil\}
 end;
 
 procedure TForm1.PasteBtnClick(Sender: TObject);
 var
   i, Level : integer;
   TNSel, TN : TTreeNode;
 begin
   with TreeView1 do begin
     TNSel := Selected;
     if TNSel <> nil then begin
       TN := Items.Insert(TNSel, SL.Strings[0]);
       Level := integer(SL.Objects[0]); // should be 0
       for i := 1 to SL.Count - 1 do begin
         if integer(SL.Objects[i]) < Level then begin
           {go up one level\}
           TN := TN.Parent;
           Level := integer(SL.Objects[i]);
         end; {if integer(SL.Objects[i]) < Level\}
         if Level = integer(SL.Objects[i]) then
           {same level\}
           TN := Items.Add(TN, SL.Strings[i])
         else begin
           {go down one level\}
           TN := Items.AddChild(TN, SL.Strings[i]);
           Level := integer(SL.Objects[i]);
         end; {if Level = integer(SL.Objects[i])\}
       end; {for i := 1 to SL.Count - 1\}
     end; {if TNSel <> nil\}
   end; {with TreeView1\}
 end;

Взято с https://delphiworld.narod.ru