calculating grand totals organisation totals observant services


i have information grouped list certain criteria, any organisation computed an normal well, genuine box bit some-more tricky values any fact rows go group. normal shown any organisation footer rows. let's rudimentary example:



report table



what i wish arrangement grand sum table footer. grand sum should computed adding any group's normal (for instance, instance grand sum should 20 + 15 = 35). however, i can't nest sum functions. i do?



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