This wiki page describes the ongoing transition from using predefined columns to custom columns (aka. custom columnfication). The reason for this is that custom columns are a superset of predefined columns. Eliminating the predefined columns will streamline both the UI and the codebase.
This custom columnfication project was suggested 2009-Aug-15 on the wireshark-dev list:
Imported from https://wiki.wireshark.org/Development/CustomColumnfication on 2020-08-11 23:12:43 UTC