Multisite subdomains without wildcards

I am running about 10 wordpress sites, all simple blogs and whatnot. I want to combine theme into one multisite that isn't open for users to add sites. I want to do this with subdomains
darkemediagroup.com
site1.darkemediagroup.com
site2.darkemediagroup.com
etc

but I don't have wildcard domains. Can I manually create subdomains and point them to wordpress? Where do I point them?

Thanks!