Please could you draw out what you're looking for? I don't really understand the excel file as there seems to be loads of duplicates.
There are a number of templates available to create Sankey Diagrams'.
Here are links to some.
There are many more online. Just Google "Tableau Sankey Template"
Hope something works out for you. Good Luck !!
I jwant to plot sankey diagrams for source to 3 targets with no measures in data.