First, NO SECTION BREAKS to do this. Section breaks are good things when you need them, otherwise they cause confusion and delay. You do not need a section break to do this.

See How to control the page numbering in a Word document.You will be operating in the footer. So make sure you can type in the footer.

1. Type what you want to appear in the footer. There should be no quotation marks.
2. Put that in quotation marks.
3. In front of that type: "If page = numpages " without the quotation marks but with the space at the end.
4. Select "page" and press Ctrl+F9 and then F9.
5. Select "numpages " and press Ctrl+F9 and then F9.
6. Select the entire footer except for the final paragraph mark. (You are showing paragraph marks, right?) Then press Ctrl+F9 and then F9.

Ctrl+F9 creates the braces for a field. F9 updates the field and hides the field code, showing the results.

If you press Alt+F9 you should see something like the following in your footer:

{ IF { Page } = { NumPages } "my footer contents to show only on last page" "footer to show on every page except last page" }

If you did that, press Alt+F9 again to toggle back to displaying field results rather than codes. Remember that the field braces must be inserted in pairs using Ctrl+F9, not simply typed.


Using Fields in Microsoft Word
Sections / Headers and Footers in Microsoft Word 2007-2013