How do you build foundations where the stairs have less than the usual four steps?

I'm familiar with the constrain floor elevation cheat and can easily make taller foundations, but I never figured out how to do the ones that only have 1-3 steps. I was unable to find a guide for it. I'd love to be able to have more variation there. Thank you.

shasta made one to show how to use Grid Adjuster to have less than four steps. https://sims2artists.com/index.php?topic=5121.0

Wow, I had no idea it was so complicated, no wonder I couldn't figure it out! Thank you.