To remove a bookmark by title in an existing document.

doc := NewPDFDoc(filename)

// how to find and delete a bookmark by title text.
foo := doc.GetFirstBookmark().Find("foo")
if foo.IsValid(){
  foo.Delete()
}

Read, add, edit PDF outlines and bookmarks Full code sample which illustrates how to read and edit existing outline items and create new bookmarks using the high-level API

The Bookmarks class also allows you to quickly find Bookmarks based on the title text. For example, the above code snippet looks for a Bookmark called foo and then removes it from the outline tree.