Once a bookmark has been created, PUBLISH allows for the modification of the bookmarks in regards to:
Hierarchy
Destination
Bookmark Title
If a bookmark has been created correctly, but needs to have a different parent section, the 4 arrow icons allow a user to modify where the bookmarks are placed within the TOC.
If a document is modified and the bookmarks is no longer pointing to the correct section of the document, select the bookmark to be modified. The Preview pane will update to show the incorrect location. Modify to show the new destination and use the pin icon to set the bookmark to this new location.
If a bookmark title is incorrect or is spelled incorrectly, right-click the heading and select Rename. The correct title can then be added to the bookmark.