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I do not understand the main purpose of this relocation, but seems default location in /var/www/vhosts/domain.tld/subdomains/sub/httpdocs is hardcoded. You can change location of document root for subdomain in /var/www/vhosts/domain.tld/conf/httpd.include but it will be overwritten by Plesk.
The main purpose is for website optimization and organization. I want to pull all of my img, css, js,... files from from this subdomain the I don't get blocking from trying to download everything from the same domain. I had tried the method you suggested and still might stick with that, but it doesn't handle any dynamic files (php). If I visit a .php file the browser automatically downloads it. So just to clarify, your suggested method is the only hacky ("but it will be overwritten by Plesk") way to to point a subdomain to folder in the primary domain?
I can't recommend you this method because as I wrote before all your changes will be overwritten by websrvmng when Plesk will perform any domain related operation.
I can't recommend anything because it is impossible now. I can suggest you just use directory structure offered by Parallels. As I know we have already submitted feature request for possibility subdomains location replacing but I have no any ETA when it will be implemented.