New SilverStripe user, pretty interested in what I have seen so far with this CMS. I've run through the tutorials, which were excellent in terms of getting started.

To continue my learning process, I figured I would port a couple of small (fairly static) websites.

The first site I have has a pretty simple navigation - but it has a wrinkle that I can't seem to figure out how to implement with SilverStripe

Navigation is laid out as so:

Root Nav A
   Sub Nav A1
   Sub Nav A2
   Sub Nav A3
   Sub Nav A4

Root Nav B
   Sub Nav B1
   Sub Nav B2

Root Nav C
   Sub Nav C1
   Sub Nav C2
   Sub Nav C3
   Sub Nav C4

Now, here's the goofy part - the client decided that they wanted "Sub Nav A1" to be the landing page for "Root Nav A".
So if you click on either "Root Nav A", or "Sub Nav A1" it would take you to the same location.

Having difficulty in determining how to achieve this functionality with SilverStripe. If I make "Root Nav A" a "Virtual Page" with the intent of having it link to the "Sub Nav A1" page, then I cannot select "Sub Nav A1" page as it no longer appears on the list (Apparently, only "Page" page types are allowed to have sub pages?).

If I change the page type of "Sub Nav A1" to be a "Virtual Page" with the intent of linking it to the "Root Nav A" content, then I cannot set a custom "Sub Nav A1" title - as it just replicated the title given to "Root Nav A".

Do I need to create a custom page type in order to achieve what I want here? Or am I missing something really obvious?

Appreciate any assistance anyone can give - thanks!