Is there something wrong with the Build Wooden Staircase construction that’s already in the game?
If you want to make them out of concrete, yes, but other walls don’t have that demand.
If it has to be concrete (or a pallisade wall), you might want to try my workaround:
You just need to build two other, cheap walls that support a roof first (that don’t require a pit).
PS: I’ve moved the topic over to the Bunker for now, as it either belongs into the Garage (if you don’t want to use wooden stairs because they are bugged) or into the Lab for the modding request.