'Vertical sum of column

I'm creating a report using RDLC, I need to sum up all the months column.

i.e. the row showing total should come after Dec-21, Sep-21...

report rdlc

Solution 1:^[1]

On the month group, you just need to add a group total, like this enter image description here

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Solution	Source
Solution 1	Nuno Rato