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Subtracting group footer sums

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mirce.vladimirov:
I use group header in my reports, so i also have group footer which presents the sums of items contained in the master detail of a single group.
In the bottom of the report, i have a band "Report Summary" whic should calculate and present the  total on the whole report. Calculating a sum of values goes very simple : in the given memo's editor i write some code like :

--- Code: ---[SUM([myLazarusQuery.MyFloatfield],BandName)]

--- End code ---
But there is a case when I should subtract some groups from the total of all sums.
There should be a way to subtract totals of a certain Group, since there is a Grouping criteria-field, how can I do that ?

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