Replace value of cells across multiple columns (with values from a column) if condition is met

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伪装坚强ぢ
伪装坚强ぢ 2020-11-27 07:51

B1  B2  B3  total
10  10   10  30
20  20   0   40
 0  20  10   30
 0  20   0   20

I have wide dataframe with over 400 variables, using the datafra

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