There are probable half a dozen ways to do it, under different circumstances. Each technique may have its own advantages.

Here is my favorite technique, which is

1) independent of date dimension. 

2) can be used from a secondary data source.

3) applicable in labels, references and annotations.

[Click here to find all my Sankey Chart series]

Quite a few people visited my post on creating 3-stage Sankey chart by cascading 2 Sankey charts. It's a scalable approach which can lead to N-stage Sankey chart using the same building block repetitively.

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