In reports, what feature allows data to be subtotaled by the previous column's data?

The feature that allows data to be subtotaled by the previous column's data in reports is indeed the "Group with previous column" option. This functionality is essential in creating organized reports because it automatically aggregates data based on the categories defined in the preceding column. When this feature is enabled, the report will generate subtotals for each group of data rather than just presenting the raw numbers, providing clearer insights and making it easier to analyze trends and patterns.

Utilizing this grouping feature in reports enhances readability and allows users to quickly assess subtotaled figures without needing to perform additional calculations manually. It effectively streamlines data presentation, ensuring that users can focus on analyzing the summarized insights rather than sifting through expansive datasets.