I’ve never heard of an “include file” in relation to dhcpd.
A quick Google search suggests that the main config file can “include” external files to augment the main config file… Is this what you mean?
“File not found” errors usually mean one of two things…
The file doesn’t exist at the specified location.
The file exists at the specified location but insufficient permission to read the file.
But I then have to remember to copy it again if I edit it for some reason. According to the openSUSE docs files are copied to the chroot jail automatically and I was hoping that there was a script or config file specifying which files were copied.
Since the jail (/var/lib/dhcp) includes various files from /etc I’m assuming they get updated as needed (at service restart?) so presumably something looks after that.