centaur
10
These icon file are hard coded into the core at lots of places… in this file …/apps/frappe/frappe/public/icons/timeless/symbol-defs.svg
You could probably add additional icons to the above file like how its done here
When that is done just do
bench build
and
bench clear-cache
You should able to select you icons.
However do note unless its in a separate app it will break when you update your ERPNext / Frappe