For the signature lines, you could use a conditional field of this form:

 {IF {= {NUMPAGES} - {PAGE} - 1} > 0  "______ ______"}

where each matching pair of braces is inserted by pressing Ctrl+F9. What
this does is calculate a number equal to the total number of pages in the
document minus the current page number minus 1. If that number is greater
than zero, it displays the lines -- this will happen on all except the last
two pages. On the next-to-last page the calculated number will be equal to
zero, and on the last page it will be -1, so the field will display nothing.

The alternative is to insert a next-page section break (from the Insert >
Break dialog) between the first signature page and the page that precedes
it, removing any manual page break that may be there. You now have two
sections in the document. In section 2, open the footer. On the
Header/Footer toolbar, click the Save As Previous button so that it isn't
depressed and the words "Same as Previous" disappear from the footer pane.
Delete the signature lines there, and close the footer. The signature lines
will still be in the section 1 footer, but not in section 2.

WordPerfect's feature of multiple footers on the same page does not exist in
Word. Conditional fields and multiple sections with different footers are
the methods of achieving the same effect.