If I do, I want to plot them separately and draw attention to them 'cause they're sticking out from the rest, if I don't ...then just extend the lines out to the actual min. and max. 'cause there were no outliers in that data set so you plot them individually if you have any, if not just extend them out to the smallest and largest observation if there are outliers you say apart from those outliers what are the min. and max. and draw your boxplot accordingly. 