You can make each stage a component however that by itself isn’t going to get you to something real useful for construction documents.
I took one set of your stairs and started modeling it as separate components. I don’t have time to do the whole thing but hopefully this gives you an idea. When I started this I didn’t know that the stringers are being ordered. Unless you have to give the supplier dimensioned drawings, you might not need to divide the steel into the smaller pieces as I have here. I was trying to make something that looks like what you drew. The dimensions are weird I think. It looks like you are just eyeballing them rather than entering actual dimensions as you model.
Each part is a component. I drew one of the bottom stringers, made it a component and then copied it with Move/Copy to make the other bottom stringer. The short beams on the bottom landing were done the same way. It looks like the next stringers were modeled so the landing supports are part of them so I did the same thing again.
Since each part is a component and is not stuck to the rest of the geometry it is possible to pull the parts away from each other for an exploded view like this…
Or you could lay them out flat if you want to do a 2D view for dimensioning.
And since I’m using components here, an edit to one of them will carry though automatically to the other instances of the component. Here I’ve opened the near bottom stringer for editing and put a hole in it just to show a change. You can see that the other bottom stringer in the assembled copy of the stairs also got the hole as did the ones for the exploded view.