In this chapter, we have seen how to use the drillthrough feature, discussing in detail several options available to model and optimize drillthrough actions. We have seen the differences between using MOLAP and ROLAP dimensions to enable drillthrough on transaction details. We have also discussed how to include a many-to-many dimension relationship in our model, highlighting that this single feature enables much more complex modeling techniques, giving some examples of the possible scenarios and providing links to external resources about modeling and optimization for this feature. In the next chapter, we will show how to add complex calculations to the model.