[Help] Train station asset - Advanced Buildings Editor

I am trying to build a large train station and I am struggling with the train station track and pedestrian connections setup. Basically, I’ve one main building build upon the default station asset as template. All other sub buildings are unique buildings, more or less by accident.

I am using Advanced Buildings Editor and I want to have 4 parallel train station tracks elevated, 4 parallel underground train station tracks, and one subway track next to the 4 underground tracks.

I have several questions:

1. Is it possible to combine subway and train station tracks in the main building asset, or is it train or subway only?

2. Is it possible to combine elevated and underground train tracks in one asset with Advanced Buildings Editor without any further mods or scripts?

3. The station is very large, how long has the train station track to be in the sense of how long does the part to be to be big enough for one train? Same for the subway, how much station track do I need and should I just add normal track until the border of the asset or even crossing the border of the asset?

4. Do a I need spawn points or just pedestrian connections to every side of the station track? Can I use invisible pedestrian connections for subway, too?

5. Sometimes my changes seem not to be saved correctly and I have no idea why. I save the asset, reload it and the tracks are missing or even if I deleted them they are still there.

6. Is it important which mods are activated during asset creation?

7. I have the feeling that fine road anarchy seems to make it very hard to branch pedestrian connection.

8. Any tips or tutorials that somebody could point out?