Simply replace the '9' in '9 of 80' with a SEQ field coded as:
{SEQ Nr}
and copy that you each of the other four labels on the page.

From then on, simply make as many copies of the labels as you need and, when you're done, press Ctrl-A, F9 to update the fields.

Note: The field brace pairs (i.e. '{ }') for the above example are all created in the document itself, via Ctrl-F9 (Cmd-F9 on a Mac); you can't simply type them or copy & paste them from this message.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]