How to create sankey with multiple destinations/layers/levels?

Tomi3321

I like to create a sankey diagram with multiple destinations/layers/levels.

Example:

A parts was produced at location "a" (first destination), goes to shop at location "A" (second destination), to customer at location "alpha".

There are production sites "a" and "b", shop locations "A", "B" and "C" and serveral  customer locations "alpha" ... "omega".

How can I realize suchh a digramm?

Thanks for assistance.