I am trying to set up a subdomain on an addon domain, and have a question...

the addon domain is already defined as a subdomain of my main domain, i.e. addon.main.com = addon.com, with the main folder of the addon being a subfolder of my main account, i.e.:
/public_html/ -> main folder
/public_html/addon/ -> Addon domain main folder

When I now add a subdomain to the addon domain (sub.addon.com), this is also placed in the main folder:
/public_html/sub/ -> Addon domain subdomain

This means e.g. that I cannot have two identically named subdomains on two different addons, and is very inconvenient.


So - is there a way to have the subdomains located within the addon domein folder? Like e.g. :
/public_html/addon/sub/