You can get stairs in the sims 2 for the PC! :]
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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 :)
well i think you cant because i have neverseen a two story house on the sims three so you cant build stairs
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.
on sims 2 pets you dont have any upstairs or any stairs at all