You used the word processor to insert the footnote/endnote and you want the processor to change the way it handles endnotes to footnotes? (as opposed to EndNote citations in the text).
http://community.thomsonreuters.com/t5/EndNote-How-To/Change-footnotes-to-endnotes/m-p/51061#M10099 discusses it I think.
if you want to convert in-text citations to footnotes, you might read this thread and note that one of the TR people said they have some tools as well in that thread.