Welcome to WebmasterWorld Guest from 188.8.131.52
I apologize if this makes no sense. I'm still new to this. I've looked around for the answers, but so far, no luck. And, I hope I'm posting this in the correct forum. Thank you.
If both domains use the same directory as their root directory then the .htaccess will apply to both domains. If the addon domain uses a subdirectory of the main domains root directory as its own root and the main domainīs htaccess file is in that domainīs root directory then Apache will first read the main domainīs htaccess file and then any htaccess files in your addon domainīs subdirectory.