I want to install DHCP which I didn't select on the original install.
Here's my problem, everytime I wanted to add packages I've been doing a full re-install there has to be a better way right?
The Redhat support doco only explains how to do using the gui interface but im text interface only.
I tried boot to the install disk and selecting upgrade but it just tried to update exisiting packages. I tried red-config-packages and redhat-install-packages but it gave a $DISPLAY error.
I searched on google and the LDP and all the faqs and other threads I find all use the gui interface to do it.
Please help!!!
This whole backing-up and re-install thing is pushing me over the edge.

Assuming your using RPM packages, from command line you'd use

rpm -i packagename.rpm

I use rpm -Uvh packagename.rpm to upgrade any old packages and see what it's actually doing.