Building stairs that fit from floor to next floor

[DonnaC]

I am a newbie. I have read and tried everything I can find and figure out on stair building. I have Home designer 10. I have an entry that is ground level, with a cathedral ceiling to the second floor. I have a main floor with second atop adjoining the entry. I have a basement that just goes under the main level. I want stairs from the basement to the entry, stairs from the entry to the main level, and then stairs from the main level to the second. None of these fit. They either plow through the floor, trying to go too high, or for the basement they do not reach the floor, which by the way only shows grass rather than a floor, and the ones to the second floor do not reach the second floor. I have tried so often I should have a degree in this, if I weren't such an abysmal failure. Please, can anyone help?