I've been trying to figure this out but have had no luck so far on getting it to work. What I'm trying to do is make a stairway or ziggaging ramp up a cliff but am unable to get any infantry to use any on the method I have tried so far.

This is what I've tried so far:
1.Using the steel staircases and gantry models, they seem to only be enviromental.
2.Using the walkable ramps from the railways objects section and placing concrete blocks between as platforms.

Another problem I have had is that I spawned an at half track which I then deleted, but it left infantry which cannot be selected and haven't been able to remove. If anyone know how to get rid of them it would be appreciated.

Thanks in advance.