Orderby and sum

Hi to all.

The result of my slice is a table with customer name - column 1 decimal value - column 2.
I would like the result of column 3 to be the sum of the decimal values, provided that the [_rownumber] <=[_thisrow].[_rownumber] in this slice

SUM(SELECT(SliceName[Column 2], [_ROWNUMBER] <= [_THISROW].[_ROWNUMBER]))
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