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You can pivot the data as you pull it into Tableau, which will enable you to do a waterfall chart. As you connect to the data Tableau presents you with the fields and data in a tabular format. Click the columns you want to pivot and right click Pivot.
This will give the following:
Note your waterfall chart looks a bit dodgy..it seems to restart with Invoice Sales
Thank you so much for your input, this solved my issue ! It's amazing how sometimes things we think are so complicated can be solved with such easiness in Tableau!