these are generic answers that apply to any templates
> I know where the templates are
good
>but do not know if I need to create a new fragment
yes, eg 30local
>or if I can just add to one of the existing ones.
no, it will be overwritten next time you upgrade
>Once I do, how do I expand so they are active?
expand-template /etc/foo & reload config files with app or
signal-event conf-foo or
or save a setting in a panel that regenerates the config files