Use the TextSelect tool from the Acrobat toolbar to highlight a sample of text. Bookmarker then uses the attributes of the selected text to define a particular bookmark level. Bookmarks can be nested to any level.
OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.