Set DHCP-Option for a Client


i need to set a DHCP-Option for a client. Think it is similar to this Thread:

IPTV and DHCP options (Vendor Class Identifier 60) - Getting Started with IPFire - IPFire Community

On Windows i can set this on the Client itself. How can i do this with IpFire? I have to set a DHCP-Option 66 for a server-name.

Can somebody help here?