Match cells and column

Hi all,

I have DATA in Column A from Row A2 : A20000 ( Debit items)
And I have DATA in Column B from Row B2: B 8000 ( Credit items)

Generally an Amount in B Cell (ex: 8500/- is divided in A Cell into 4000(A4),3000(A8),800(A12),500(A15),200(A18)=8500 (B2))

Now I want to Match Rs 8500/- to Cells in Column A.

What is the Formula to find the Cells in Column A to Match B2 Cell

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