subdomains

For convenience, is there a way to create subdomains automatically from a file?

The following Knowledge Base article show you some easy ways to create subdomains
http://myhosting.com/kb/Creating_and...ing_Subdomains

I'm sure you could create a Bash script that creates a subdomain.

Shane.

Here's another option on cPanel based hosting.
Free PHP Scripts :: cPanel Subdomains Creator