This article explains how to use SUMIFS functions
SUMIFS(DA_C, DA_A, 1, DA_B, 2)
SUMIFS(DA_C, DA_A, QA, DA_B, QB)
SUMIFS(find_column_reference, criteria_column_reference1, criterion1, [criteria_column_reference2, criterion2, …])
The part of the formula between brackets  is optional. You don't include the brackets in your actual formula
The formula can look overwhelming but is actually pretty simple.
The next part are pairs for all the conditions you want to check. You first provide the column reference of where to match the condition and secondly provide the condition to be met, e.g.,
criterion2, … (optional) - additional column references and criteria to test.
Learn more about sumifs in one of the following articles