A system and user interface capable of effectively manipulating high volumes of data is provided. The system and/or user interface is specially-configured to aggregate large data volumes and translate the large data volumes into summary information associated with navigable categorizations (e.g., categorizations linked to selectable visualizations in the user interface) that enable dynamic selection and visualization of portions of the large data volumes. In one particular example, the system and/or user interface is adapted to generate selectable panels having a plurality of build or editing tools displayed coextensive with portions of the large volumes of data. Such panels may be particularly useful for generating a placement (e.g., an advertisement) while reviewing or managing large amounts of information, such as ad placement and performance information for hundreds or thousands or advertisements.