in my project man can entry their income or expenses. like: paper sale, pencil sale etc. they entry it like: paper $200.00, pencil $100.00. they also made a group or category. here they entry paper and pencil under 'sales' group. so every thing depend on user. here I want the report show 'sales = $300.00'. cause this is the total sum of paper and pencil. but I don't know the group what? so how it possible to make report of the various group's sum will show with group name.