I'm looking to setup Active directory for my workplace. We have a main office in Ohio and two remote offices in Texas and California. My goal is to have a domain controller at each office, we already have the necessary VPN connections in place to connect the remote offices back to the main office in Ohio.
Currently we have the following domain structure in place: The main office DNS server suffix is oh.company.com and the remote locations are ca.company.com and tx.company.com.
I'd like to have an active directory domain setup for each of these all under the company.com forest. I understand how to setup the remote locations by simply selecting create a new child in existing forest when setting up the domain controller. My confusion comes when setting up the domain controller at the main Ohio office. From what I can tell you can only run a single domain on each Windows Server. I really don't want to have to run a server to host the forest and another to host oh.company.com. I'm assuming there is a better way to set this up.
My alternative would be to put all the offices in the same domain, company.com, but I'd rather have them in their own domains. I'd appreciate any thoughts and suggestions on how to setup this configuration.