If the entries in the table of contents are already linked, then
you can create outlines automatically from those links. Usually this
yields more precise results than linking directly through the text.
Choose the menu item Tools → Outline and Link Automation →
Create Outline From Links...
This will bring up the same dialog as above, but will use the
exisiting links instead of the text in the table of contents to create
the outlines. PDF Nomad 2 will create an outline item for each link.
It will attempt to create a hierarchical outline in as far as the
links suggest a hierarchy, but, if necessary, it is easy to further
arrange the entries into a hierarchy as explained under the heading
Batch edit outline titles and batch reorder outline items
above.