Exporting/importing into Excel

I wish to export my Endnote X7 library into Excel in a way that would be as easy as possibly to import back into Endnote. Any recommendations as to how?

My reasons for wanting to export the references into an Excel-file is that I want to add a random number to each reference. This way, when I import the references back into Endnote, I will be able to sort the references according to the random number each reference has been assigned to. It is pretty much the same method as outlined in this thread: 

http://community.thomsonreuters.com/t5/EndNote-How-To/Random-allocation-of-references-in-Endnote-library/m-p/12375#M4672

Unfortunately the thread does not outline exactly how this is done.