cumulative sum in script area

[Carlaf_93]

Good evening,

i've an excel file like this:

DATE,QUANTITY,MONTH, YEAR,

01/01/2021, 10, 01,2021,

05/02/2021,50,02,2021,

06/03/2021,80,03,2021;

I would like to create in the script area a cumulative value--> 

YEAR, MONTH, QUANTITY

2021, 01, 10,

2021,02,60,

2021,03,140

P.S. i need to do it in the script area because i have other tables with different data field

[Carlaf_93]

if i have a value from the previous year i want it in the sum....