I don't think the OP is asking about starting numbering after page 1. The question is to have nothing if there is only one page, but Page X of Y if there IS more than one page.
I think that means having Page 1 of X on the first page if X > 1.
I think.
In which case, you can set up an IF field in the footer like this:
{IF { NUMPAGES \* MERGEFORMAT } > 1 {AUTOTEXT "Page X of Y" \* MERGEFORMAT} "" \MERGEFORMAT }
IF fields operate as:
IF Expression operator Expression True Text False Text
so, IF NUMPAGES (in document) > 1 True Text = AutoText entry "Page X of Y" False Text ""
If NUMPAGES is 1 then the field text is "", if > 1 then the field text is "Page X of Y", where X is current page number (including 1 on the first page), and Y is numpages in document.
Things could get tricky if you are using Different first page in your header/footer; or Section breaks with different starting page numbers, but for a simple document, the field code should work fine.
Note that you can NOT just type in the curly brackets. You must either use Insert > Field, or use Ctrl-F9 to enter the field parameters. It will not work if you copy and paste the field code posted here.
Gerry
My paintings and sculpture