Microsoft Project and Inserting Columns

I am doing a LOT of work right now with SAS and Microsoft Project using the Microsoft Project interop, Base SAS, and SAS/IntrNet. One of the client requirements was to add in additional columns to the default MS Project columns. Well, I searched high and low and couldn't figure out how to do it. After some slogging, here is what I came up with:

    class MsProjectTest
    {
        Project p ;
        object m = Missing.Value;
        string file = @"c:\temp\test.mpp";

        public void Process()
        {
            Application app = new Application();
            app.Alerts(false);
            p = app.Projects.Add(m,m,m);
            Task t = p.Tasks.Add("Test", m);
            t.Name = "Test Node";
            t.Start = "03/20/2009";
            t.Start7 = "03/31/2009";
            p.Application.TableEdit("Entry", true, m, m, m, m,
            "Start7", "Start Test", 10, PjAlignment.pjLeft, 
            true, true, 255, 1, 4, 1, m, m);
            p.Application.TableApply("Entry");
            p.SaveAs(file, PjFileFormat.pjMPP, m, m, m, m, 
                     m, m, m, m, m, m, m, m, m);
            app.Quit(PjSaveType.pjDoNotSave);

            System.Diagnostics.Process.Start(file);
        }
    }

I hope this helps some other interop developer out
there struggling with the same issue.