how add dictionary and and array to my code to make a quick

hello
I got this code from the internet to merge and summing duplicated value when summing the duplicated values should see to COL A,B,C together and put the result start COL g my code is very slow and just see to COL A so I want Use dictionary and array to make it fast especially my data are increasable

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thanks

Your current code is only summing the duplicate of Col.A, not Col.A, B & C altogether.

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it's very great thanks so much that what I want