Jeff:
You cannot create a functioning Section Marker by drawing lines and arcs in the 2D Symbol window, you have to write GDL code. If you open the 2D Full View you will see the results of the code, which is typically done on the 2D Script window, but in this case is calling another library part (in this case "Sect-Elev Marker Macro USA") in the Master Script. If you "Comment out" the Master Script (by adding "!" before each line (so the code is not read)), then your drawn symbol will appear (albeit very small, as the circle is about 5/8" in diameter), but none of the text showing the drawing and layout references will work. So you can create a dumb Section Marker by drawing in the 2D Symbol Window, or you can write code for a functioning marker. As the referencing aspect is complicated, I recommend making a copy of a functioning symbol, then modifying the code to get the 2D appearance that you are trying to achieve.
David