Yes, of course you can have more than one sub-domain on your account, it's one of the best ways to run multiple websites from the same account.
To add a new sub-domain- Login to your website control panel
- Click on Sub domains
- Enter a new sub-domain into the box (without www.)
- From the dropdown menu, choose the domain you want after your sub-domain
- Click on Create Domain
You can choose from many domains including those of your particular host, your own add-on domain name, and some generic domain names like isgreat.org or 2kool4u.net among others.
Once you create a new sub-domain, you will see a new folder appear in your FTP and File Manager with the new sub-domain name such as me.2kool4u.net, any contents intended for this new sub-domain must be uploaded into the
htdocs file within that sub-domain folder.