The sites themselves are separated, yes, but their locations are not. I want to be able to group the sites in different directories, as my examples shows. Here is a more practical example, grouping sites in “departments” and “personal”.
blog.mysite.com/departments/site1
blog.mysite.com/departments/site2
blog.mysite.com/departments/site3
blog.mysite.com/personal/site4
blog.mysite.com/personal/site5
blog.mysite.com/personal/site6