Unfortunately, rollable tables do not function like a traditional lookup table like most gamers are used to. They are merely a listed of items, each of which has a weighted chance to appear when the table is invoked. There's no way to call a specific result, nor to weight the randomization (such as "roll on this table at +10"). If they could do that, it would be really amazing. You could create simple little flat file databases within a game, for instance.