i tried the following:
my primary domain is "domain1.com".
then i create "my.domain1.com", cpanel creates the folder ~/public_html/my (which, i may just symlink to any places)
now for a totally different domain/application, i create an addon domain "domain2.com". and i need "my.domain2.com". (the same subdomain name, but it's another app under another domain) now cpanel would point my.domain2.com to the same ~/public_html/my folder which is for my.domain1.com.
seems like i can't break them into 2 different apps?