I was looking for same info. I get it to work fine pressing F5 to delete then redesigning the walkway whilst in same edit mode but if i have completed the walkway and saved it how do i delete to start again?
Was my last explanation not clear enough ?
What do you mean with "start again" ? Start in the same situation as when you first enable the passenger waypoints ? If yes, my reply explained exactly that:
What's your situation when you start, before adding any waypoints ? You see only one thing, the Pax Gate, which you are supposed to move to the terminal door, and then start adding waypoints.
So, by following my previous instructions, if you remove all the existing waypoints with F5, you will end up again in the same initial situation, with only the Pax Gate objects, which is now already on the terminal door but, of course, you can just move it and then add waypoints, move them, etc. No difference.