How to config other root domain on Frappe Press

I already setup successfully Frappe Press with abc.xyz is my first root domain for example, i already setup proxy server with this domain. i can use all function of press. Now I want to add another root domain (xyz.abc for exp) so I can create a site with that domain. i already add another root domain to my press. but i don’t know how to setup config to use this domain. any one know this usecase. Help me pls~!