go to the build mode and when you do the base of the house, there should be a small picture of stairs, if you click on that, it will bring up the stairs.
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Yup, up to 5 floors!
You have to go to the build section and buy stairs and then you have to make a floor.
use the sledgehammer tool and click the stairs
Unfortunately, you can't actually build stairs/upstairs for the sims on ps2 :'( get the sims 3 or the sims 2 (computer version(s)) to do this. Both work on pc, but only sims 3 works on mac :)
Easy U make the first story, then u buy stairs and move up a level then u make tht story,then u buy stairs then move up a level.