The Export button 
allows you to export your auction data in a variety of different formats; the most common being an Excel spreadsheet. Users can then take the exported file and pass it on to online auction-simulcast hosts such as Proxibid and Bidspotter or send it to a publisher.
The numbering fields just to the left of the field description, 
, define the column that this information will appear in (i.e. 1 = 1st column, 2 = 2nd and so forth).
If you have images you wish to export as well, make sure you choose your image options accordingly. The images will then be exported into the folder with the spreadsheet (or whatever file type you choose).