I have to draw another story, and I am doing that by marking my ground floor as "show as trace refrence". the problem is, when I am making the slab for the ground floor, it does not follow the ground flour contour walls.( see pictures below). What should I do?
Your first screenshot shows that indeed snap to grid is turned on (there is a little dot near your cursor). It must be disabled in order to model freely.
Separately - if your other story is relatively similar to the ground floor, it can be easier to copy the ground floor elements to that story and then edit them as needed vs modeling from scratch. Even if the wall construction changes, if the reference lines are in the proper places, you can just select all walls on the new story and change their composite/type. Etc.
One of the forum moderators AC 27 USA and earlier • macOS Ventura 13.6.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB