I have always been confused on this subject (if there is a simple solution please let me know). When i first start up a flight i file my flight plan. In @Mark_Denton 's flight plan video he used waypoints from the runway he was obviously going to take off from. Now for example Schipol (EHAM) There are multiple runways to take off from.
Now from which runway should i file my flight plan from, because the ATC can instruct me to taxi to another and it would kinda mess up my flight plan having to replace it (maybe the runway faces the opposite direction to where i want to go). Apart from requesting to taxi to that runway is there another solution? (Apart from making another) Please let me know if i have but this under the wrong topic :)