This is perfect for my needs, thanks for helping me out.

And thanks Dave, for writing the original plugin.

I've used the free plugin "Root Category Lock" that allows only CMS admins to create root-level category records.

The plugin is provided in Dave's July 2nd post to this older forum topic:
https://www.interactivetools.com/forum/forum-posts.php?postNum=2234284#post2234284

It works great!

~ Deborah

In a category menu set-up it is possible to disable the adding of records, and to limit the number of records that can be added.

I would like my user to be able to add an unlimited number of subcategories, but not be able to add parent categories.

For example. I will create Parent Categories 1,2, and 3 before passing it over to my client. The client would be able to add as many subs as they wish to the existing Parents, but would not be able to add a Parent Category 4.

Parent Category 1
Sub 1a
Sub 1b

Parent Category 2
Sub 2a
Sub 2b

Parent Category 3
Sub 3a
Sub 3b

It's not vital, it would just be handy to have to keep some clients under control who have a tendancy to add loads of pages.

Thanks