Colin on 14 Mar 2017 09:03:53
It's common to find Excel data sources with merged cells as column headings and nested "sub-columns".
Please add built-in support for unpivoting nested column groups.
An example of a work-around:
https://wessexbi.wordpress.com/2014/02/27/unpivot-nested-headings-with-power-query/
The Tabealu Data Reshaper add-in for Excel can detect these column groupings automatically.
https://community.tableau.com/docs/DOC-10394