How to create subdomain in reseller level?

For example my reseller domain is www.abc.com. How can i create a subdomain for my reseller domain? i am asking this because reseller level not as user level where the 'subdomain' option is not available.

Please advice.

Reseller doesn't have that function. You will need to do in User level.

Or more specifically, click on the User level after your reseller login. That's a full user level control panel, and you should be able to add subdomains there, if your hosting company has enabled the option.

Jeff