14.2.2 Derived Variables ↑

14.2.2.9 Parent Slug

When a Seq field is specified for a Collection, possibly in combination with a Level field, then a special variable name of parent-slug can be used in a Merge Template in order to obtain a link that points from the current Note to its parent in the implied hierarchy.

The resulting HTML will generate something that looks much like the link to parents created when you Export as Web Book.