[Koha] Editing koha-sites.conf to allow for multiple instances

Greetings all, I am experimenting with setting up a second instance of Koha on my server. While I have the second one up running, including SSL, I cannot figure out how to edit the koha-sites.conf file so that I can access the staff page using https://[library1]-admin.[domain].org and https://[library2]-admin.[domain].org instead of https://www.[domain].org:[portnumber]. I have already tried to copy and paste this block: DOMAIN="[domain]"

INTRAPORT="80" INTRAPREFIX="" INTRASUFFIX="-admin" OPACPORT="80" OPACPREFIX="opac" OPACSUFFIX=""

and change the ports that were used, but, alas, no luck. Thoughts on what step I am missing? Or did I overlook the information in the Wiki? Thanks in advance. Best, Sterling