How do you "unlink the relevant footers"? There is no such thing as "unlink" in word according to a help search.
In Word 2007 and later, activate the header/footer view (for example by double-clicking the header). Move to a footer that you want to unlink and then click to deselect the Link to Previous button on the Header & Footer Tools Design tab. Repeat the procedure
for any other footers that you want to unlink.
Note that each Word section can have up to three footers (and also three headers): first page, even page, odd page. For all footers and headers to be available, you have to select both "Different odd and even" and "Different first page" on the Header & Footer
Tools Design tab.
Each type of footer (header) must be separately unlinked from its "neighbor" in the preceding section.
For more, see http://wordfaqs.mvps.org/FrontMatterRibbon.htm and
http://wordfaqs.mvps.org/HeaderFooter.htm.