To add a watermark only to selected pages, we must separate the document into sections. For example, if we want to apply a watermark only to the table of contents in a document, we must create three sections: a cover page section, the table of contents section, and the rest of the document text in its own section. When we insert a cover page in a document, it has a separate header so that we don't need to create a separate section for it if we're creating sections to add a watermark only to selected pages.
