In the Reference Type list, choose Footnote.

Choose Insert | Reference | Cross-reference to display the Cross-reference dialog box.

In the text for footnote 3 (at the bottom of the page), position the insertion pointer where you want the forced footnote to appear.

Select the new footnote marker (4) and format it as hidden text.

The marker for this footnote is 4, and it should appear right next to the marker for footnote 3.

In the body of the document, just to the right of the marker for footnote 3, create a new footnote.

In the body of your document, create your regular footnote 3.

Let's say you want to create a footnote inside of footnote 3. There is a way around even this drawback, however. Your fudged footnote isn't recognized by Word, so the next time you enter a footnote, its numbering continues from where Word thinks it should continue, not from where you know it should. The only drawback to this approach is that it plays havoc with automatic footnote numbering. The only thing you can do is to 'fudge' the footnotes-format your own footnote mark, press Enter at the end of an existing footnote, create a corresponding footnote reference at the start of the new line, and then enter the text for the forced footnote. If you select that footnote mark, copy it, and paste it into the footnote at the place you want, you still don't get the opportunity to enter any new footnote text. If you try to place a new footnote while the insertion point is located within an existing footnote, all that Word does is duplicate the footnote mark at the beginning of the existing footnote. It doesn't provide a way to add footnotes within footnotes, however. Word does a great job of creating footnotes, using either your own footnote marks or automatic marks.

(For those with a linguistic or literary bent, you can find out about footnotes within footnotes by referring to a style guide, such as Kate Turabian's book, Manual for Writers, or the Chicago Manual of Style.) In some types of documents you may actually need footnotes within footnotes, such that a footnote can be footnoted, with the 'sub footnote' appearing in the regular flow of the main footnotes. Footnotes are a common feature in many types of documents.

How to insert a footnote