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GROUPBY's total_depth only ever added one Total line. In Excel a depth of N adds a subtotal line for each group of the first N - 1 key columns (after the group, or before it when the depth is negative) and labels the last line "Grand Total"; a depth greater than the number of key columns, or above 1 with field_relationship 1 (a flat table), is #VALUE!. The subtotals aggregate the group's source rows, so AVERAGE and COUNT subtotals are right too. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>