Custom columns in csv - how it works?

[Razjel777]

Hi!
After studying the documentation available on Wiki (https://github.com/john30/ebusd/wiki/4.1.-Message-definition) I cannot find any information nor examples how the custom columns in csv work? How should be named each o the columns for fields? And how could they be add to mqtt-hassio.cfg. I have tested this possibility only with the predefined columns name but after adding a new column before field section, it stopped working. Same with adding more field

Why am I looking for this possibilty? Because I would like to add a new column with "entity_category" which can be used in Home Assistant. This will help me organize entities and seperate "config" from "management" ones. :)
Or do you have any idea how to add entity_category for each row (entity)?