I have been successful in creating a custom column that combines other columns. For that I used the one that acts like tags. This is the template:
{#series1:||,}{#series2:||,}{#series3}.
However, when I try to proceed with making the custom column hierarchical, it does not show up in custom metadata and the tags are not draggable.
For example, this is a previous column that works:
and my current one which does not:
Is creating a hierarchy something that you cannot do with custom composite columns, or am I missing something?
Thanks