The expand-template command builds a new config file from “system” templates and custom templates.
If there are for example system tenmplates 10base, 20dns and 30dhcp and so on and you create a custom template 26unbound_rbl, after expanding templates you have a config file with
- 10base
- 20dns
- 26unbound_rbl
- 30dhcp
If you want to change a value at a system template, for example 20dns, you have to copy it to templates-custom and change values there. At this case the system takes your custom template instead of the system template.
You only have to delete your custom template and do the expand-template command again.