SUMIFS(...)
Nested sumif to get the final sum
Used Functions
Category: Math and trigonometry
Adds the cells in a range that meet multiple criteria
Syntax
SUMIFS(sum_range, criteria_range1, criteria1, [criteria_range2, criteria2], ...)
Practice SUMIFS Formula at Sheetzoom
SUMIFS formula at Microsoft help
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Nested sumif represents multiple nested criteria that can be achieved by using and a better suited function i.e. SUMIFS() for the purpose. This function takes multiple ranges and multiple criteria to get the final sum.