Hello Odoo Gurus of the world.

Newbie here with a multiple website question.

I have a self hosted Enterprise Odoo with 3 companies.

Odoo and the VPS is working with a subdomain of one of the companies,
 ej, erp. mydomain . com

This was achieved simply by adding a Type A DNS record to the domain with the prefix ERP and the IP of the  VPS. Worked like a charm on the first try.

Then i went into Odoo added the 2 companies, and tried again, Settings Website, Domain 

erp. secondomain . com

Added the Type record pointing to the VPS

But this wont work, im getting 404 error

Im I missing something? 

How can i get every company working on its own domain?

I don't want quotes sent from erp . secondomain . com coming back to erp. mydomain .com 

all pointers suggestions are welcomed.