I would agree that under the right configuration/circumstances placing different basic fitting types would be possible with the procedure suggested by Matthew, but if you consider what those ‘right’ configuration/circumstances are, you would have to admit that they would rarely be encountered.  

Refer to the attached example:  2” NoHub cast iron short sweep and quarter bend, you could get them to populate the Design Line correctly IF they were fitting-to-fitting with a coupling between. The user would have to draw the design line offset with the precise total lay length. Does anyone have that distance off the top of their head?

I am interested in a general solution to the problem.