Here is an example that you can use and edit. Basically you need to create the observations in your dataset at the correct y value and use the markerchar option:
invoicey = 100000; make = "Acura"; char = "*"; output;
invoicey = 100000; make = "Audi"; char = "*"; output;
invoicey = 100000; make = "BMW"; char = "*"; output;
set cars cars2;
proc sgplot data = cars3;
where make in ("Acura" "Audi" "BMW");
scatter x = make y = invoicey / markerchar = char markercharattrs=(size = 15 color = red);
vbox invoice / category = make;
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