How do you make 2nd floor with pillars and pathes

Hi i need help

How do you make a 2nd floor in your room with pillars and petal cause everytime i do and out a portal on top i keep going to the bottom

Just place them on top of them ?

Wat im confused i could probably do it but i dont know wat you mean

I shall do it for you as I am a good room designer. xD

I've done a room like that for another person on the forum and my room has a bit like that in it. I'll f/r and tell you if you want