Add a subdomain to your hosting account
For SmartVPS accounts:
- Log in to your Dashboard
- Navigate to VPS HOSTING

- Select your VPS: yourvpsname.com
-> Click Manage (green button)
- Go to Web Sites

- Click Add New Website or Subdomain to this VPS (green button)

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Follow instructions.
Now add the DNS entry for your subdomain
- Log in to your Dashboard
- Navigate to DNS

- Select your VPS/Domain: yourvpsname.com
-> Click Manage DNS (green button)
- Click -> Edit DNS Records -> Add DNS Record

- Add your subdomain in the Hostname Field. i.e. If you are setting up "dev.yourvpsname.com" you'd enter "dev" in the Hostname field
- Change the Type a CNAME
- Enter your domain name in the Address field. i.e. If you are setting up "dev.yourvpsname.com" you'd enter "yourvpsname.com" in the Address field
- Save
Done!