Setting up numbering within your text requires a little ingenuity. The trick is to take advantage of Word's SEQ field.

Microsoft Word’s page numbering feature is so powerful and flexible that it often confuses users. Knowing how to use Word’s four page-numbering fields will clarify most every usage.

Ctrl+A select everything. Then press Ctrl+Shift+F9. That normally updates fields with numbering. Whether it will work with sequences as you describe, I don't know.