I have fixed all the repeating subcategories, nested them the right way and marked the repeats for deletion. The list you will see in Category:Rowley Name Study is alphabetical only - the system software works that way. It also puts them at the top. You have no control over that if you want everything to link to everything else, which it must in order to work. Please do not start putting numbers in. (This will also mean that, when you add a category to the top of a person-profile, then you will have to remember what the number was!)
"Companion Category" is just my fancy way of saying "there's another page". Your One Name Study is composed of basically two pages: the freespace page (which is your main project page) and your category page. These two must remain. Of course, you can create other freespace pages to add on; for instance, I have a Stanton Heraldry and a Cornwall Stanton migration page linked to my Stanton Name Study. So you have "Main Page" and "Companion Page". Sort of.
If you have an assigned Mentor who is away on a trip, you should really wait until he/she is back. But if you are bursting to continue, do ask me. :)