Thank you, I have downloaded them now.  I am trying to do our initial setup of Design Line, starting from assigning button codes.  I am wondering if there is a list of standard button codes used by CADmep users for each type of fitting.  No matter what I have done so far, I cannot get design line to put a rectangular shoe tap on a rectangular piece of straight duct.  I can get the round design line to fill in correctly with a conical tee fitting but just not the rectangular.  I am suspecting that I do not have the button codes set up correctly.