Navigation Levels - Subnavigation etc.

[soy]

Hello guys.

Aweseome project, I totally love building sites for this CMS.

A client has more than a few pages and needs more levels of navigation.
Ex:

Head 1
Head 2
Head 3
- Sub 1
- Sub 2
- Sub 3
Head 4

Now I do not want to show up "Sub 1-3" in the Main Navigation, but whenever I am on the pages "head 3" or "sub 1-3" I ONLY do want to show up this part of navigation-tree.

Has someone an idea how to handle this? I am a totally PHP-Beginner (because of that I am so happy about the easy CMS-Integration in HTML/CSS).

Greetings,
Soy.

[Moved the topic into a more fitting forum section, this is not a developer's question as far as the forum sections here go - polyfragmented]