Это делается с помощью меню, где special = rootline.
Пример из ts_ref:
page.2 = HMENU
page.2.special = rootline
page.2.special.range = 1|-2
page.2.special.targets.3 = page
page.2.1 = TMENU
page.2.1.target = _top
page.2.1.wrap = <HR> | <HR>
page.2.1.NO {
linkWrap = | >
}
... creates a menu like this:
Page level 1 > Page level 2 > Page level 3 > Page level 4 >
(The menu starts at level 1 and does NOT link to the current page (-2 is the level before). Further all pages on level 3 will have "page" as target and all other "_top")
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