Some kind of reporting structure that can produce a pie chart or bar graph showing some kind of sector allocation report. This can be useful not only for stocks but also for other assets or maybe income/expenses.

For example, if I spend money at McDonalds, Pizza Hut and Dominoes, I can see a report that shows how much money I spent at each individual place, but if I can categorize Pizza Hut and Dominoes as Pizza places then my report can show me how much I spent at non Pizza places vs Pizza places!