Did you get any help on this? Can't find anything specific in the GDL reference manual, or on the GDL Centre.
I did figure out that in order to automatically refer to the drawing number and layout number, you need to use the following:
txtRef = "<MARKERDRAWINGNUMBER_R>" + AC_DrawingGUID
txtLayout = "<MARKERSHEETNUMBER_R>" + AC_DrawingGUID
Still trying to figure out how to test for which end of the section line is being drawn, so I can draw a 'tail' on the section...as is drafting convention.