I'll try to explain as clearly as possible, I have a station that I build on a viaduct over water (raising ground level first, placing the station, bridges under it, then lowering the ground).
Then, I would like to link the platforms to an entrance below. I can't figure out any use for the under track entrances because the viaduct is still too high over ground level. I lay an extra platform along an existing one then lower it to ground level. This allows to me build a footbridge between the platform on ground level and the one next to it on the viaduct.
However I can't find an elegant way to connect the second platform, on the opposite side of the tracks. Is there a way to achieve this other than building another footbridge over the tracks?
For example, it would be perfect if we could place an intermediate level, allowing access to the second platform thanks to an underpass, from the footbridge spanning at mid-level from the entrance platform.

(Here's a picture of my station: https://drive.google.com/file/d/1I_2_HZVg9wVJGfWOf8apYNiAjj3BF89Q/view?usp=sharing )