I am creating a drupal web site using drupal v5.1.
To make sure that the primary and secondary menus in the header show up for the right pages (and because I like things to be organized into their correct organizational hierarchies), I have set up my sites entire structure in the Primary Links menu:
I. Primary links for the site at the rootmost level for the Primary links menu.
II. Secondary links for the site one level indented in the Primary links menu.
III. Tertiary links for the site two levels indented in the Primary links menu.
The Primary are 4 major divisions of this site (it's a big site), that display at the top of the header; and the secondary links are the main sites sections within each of the 4 major division, that display horizontally across the header like tabs. The Theme I'm using (Garland) does this by default.
However, I also want to display the tertiary links. Each set of tertiary links are meant to be a list of pages for a main site section (i.e. for a set of secondary links), running vertically in the left sidebar.
This set up would mean that the secondary links are tabs running across the top of the page, and then for each tab, there is set of sublinks (the tertiary links) that appear on the left sidebar when you click on a tab. This is how most web sites are laid out nowadays.