1. Simple. Just add target line with starting point 9000’TVD, 4500VS and ending point 9000'TVD, 4501VS. That will display 1 single point (actually a very short line) on the crossection.
2. More sophisticated. Load your vertical well(s) as lateral(s), define appropriate Xsrf, Ysrf, KB in the header and add tops to that vertical well. Now you can display that well with tops, logs everything on the same crossection.
3. If you have X-Y-TVDss data - load them as polygon and you can display that polygon as a projection on your crossection