Custom Page Numbering Format

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If you insert the "S" in the main body of the document by using a SEQ field you can then have the table of contents reference that SEQ field so that the "S" is included with the page number.

In the table of contents, \s "test" includes the "S" from the SEQ field whose field name is "test." 

In the SEQ field, the \* ALPHABETIC \r 19 switches inserts the letter "S". 

In the footer (or header), reference the "S" by adding { SEQ test \c } before the page number field. 

To insert a SEQ field, you can use Ctrl+F9 to add the field delimiters, { }. (On some keyboards, you have to press Ctrl+Fn+F9 rather than just Ctrl+F9.) Type the code as shown. You can show/hide field codes with Alt+F9 (Alt+Fn+F9). Update any field in the selection with F9 (or Fn+F9).

In the footer (or header), you can add Page numbers that are preceded by a single letter can be created with a SEQ field. 

See also the "Adding chapter numbering" section in the article at http://wordfaqs.ssbarnhill.com/TOCTips.htm.