How do I install additional Dc from a remote site

We have single domain with 3 remote sites. I configured the server from the main office and then shipped to the remote office. All are working fine.

Now i need to add 4th remote office which is out of the country and hence i can't bring the server to the main office to setup. Site to site VPN connectivity between the 4th remote office & main office is established. How can I add additional DC from this site?
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Alexey KomarovChief Project EngineerCommented:
 Create a system-state backup of an existing DC in the same domain as the server you want to promote and restore that backup to a location accessible to the server ( DVD) that you're promoting, perform the following steps:

Start Dcpromo in advanced mode--go to Start, Run, and type dcpromo /adv
When the introduction screen appears, click Next.
When the compatibility screen appears, click Next.
Select "Additional domain controller for an existing domain," then click Next.
Select "From these restored backup files" (as this Figure shows), browse to the location of the system-state restoration, then click Next.
If the restoration was from a DC that served as a Global Catalog (GC) server, Dcpromo will ask you whether the new DC should be a GC. Make your selection, then click Next.
Enter the name of a domain administrator account in the new DC's domain, then click Next.
Enter the locations where you want to store the Active Directory (AD) information, then click Next.
Enter a location where you want to store SYSVOL, then click Next.
Enter a restore mode password in both boxes, then click Next.
On the summary screen, click Next to begin the promotion process.
After the DC promotion is complete, click Finish.
Click Restart Now.

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