Symbolic link to system/domain.com/conf folder

I have having difficulty running a program (Miva) on a new domain. With domains where it is running fine, there is a symbolic link at the root of the vhosts/domain.com/conf pointing to the conf files in the vhosts/system/domain.com/conf directory. I don't recall manually setting this up, but perhaps I did. Could someone tell me how to set up this symbolic link or clarify how to do it in Plesk if I am missing something.

Thanks in advance.

Robin