Use Custom Domain

I am using (just say) domain.com
I would like another website as sub.domain.com
The namesevers are parked with 000webhost
How do I do this?

@Mr12345toddy To create subdomain for your parked domain.
First create a new website with your subdomain name.
Then go to your main website…“Set Web Address” – “Manage” – "Link Website"
Now Select your main website.
Then “Tick” “I want to use a subdomain”.
Now add the subdomain name(must be same as your subdomain website name) and click on “Connect”.

Any doubts reply back or PM me.

Although there is no feature I don’t think for free subdomains using your own domain.
You can use Akhil’s method above but when you visit http://sub.yoursite.com and http://yoursite.com it will be the same I presume and you will probably lose http://www.yoursite.com