Improving Wterfall chart features - Subtotals

[thomas34]

Add the same functionality you find in Excel 2016 to waterfall charts: A way how you can select a data point as a "sub total" so that its bar starts at the 0 line again...

[sleo87]

This is very useful when trying to present a P&L financial report as a graph. Right now, I can't produce such a P&L. Thank you.