Merge multiple Columns

Hi there,
in my data set I have the following format: “The Sample Data file attached below with input and desired output sheets”
knimeSampleV1.xlsx (13.5 KB)

I want to put all the unique bracket values from the three columns in one column and then fill the total amounts for benefit, and if no there a zero will be printed, so instead of having many columns I will have more rows. Thanks in advance
the desired output is as follow:

Duplicate of merge multiple columns in one column