Advanced Group formatting question

I'm trying to make a quiz of all the stations on Chicago's commuter rail system metra. I'm wondering what is the best way to customize whether stations count as 1 or multiple points but have everything show up under each line. A couple of edge case examples-Joliet is the intersection of 2 different lines with different mileposts (I'm doing milepost as a hint), so I want it to show up as 1 thing; on the other hand, there are 3 different 103rd st stations on different lines (all of which you can get by typing in "103rd"). I know this is a pretty advanced edge case but I was wondering if people had some insight? Would this be easier without the milepost clue? Thanks in advance for any help!