How do I set subdomains for diffrent areas, eg have a login.domain.com which goes to the same place as admin.domain.com.

You can set the directory for the subdomain when adding the subdomain - just give the same folder as for the other subdomain.
The folders are all inside the main folder of the customer...

I'm talking about for the main domain not a customer account

Then you might have a deeper look in the apache documentation and configuration.

Easiest (well shortest) way is to pop a redirect into the apache config.

Or you can pretty much replicate whats in the 00_master.conf but changing the sub domain to the sub domain that you want.

yes - also make sure the the name resolves... otherwise you won't reach the server...