Group: used to eliminate duplicate values in the report.
Association: used with grouped item that displays data only when the values are changed.
ProctLine ProductName Quantity Revenue
--------------------------------------------------------
Soaps LUX 100 1000
200 2000
300 3000
TIDE 100 1500
SHAMPOO GARNIER 100 4000
200 8000
SUNSILK 100 5000
--> Here, ProductLine is a grouped column and ProductName is an Associated column.
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