Model teklamodel = new Model();

      Point point = new Point(0, 7000, 0);
      Point point2 = new Point(1000, 7000, 0);
      Beam Beam1 = new Beam();
      Beam1.StartPoint = point;
      Beam1.EndPoint = point2;
      Beam1.Profile.ProfileString = "HI300-15-20*300";
      Beam1.Insert();

      Beam Beam2 = new Beam();
      Beam2.StartPoint = new Point(500, 6000, 0);
      Beam2.EndPoint = new Point(500, 8000, 0);
      Beam2.Class = BooleanPart.BooleanOperativeClassName;
      Beam2.Profile.ProfileString = "HI300-15-20*300";
      Beam2.Insert();

      BooleanPart Beam = new BooleanPart();
      Beam.Father = Beam1;
      Beam.SetOperativePart(Beam2);
      if (!Beam.Insert())
        Console.WriteLine("Insert failed!");
      Beam2.Delete();

      teklamodel.CommitChanges();