If you have some way of selecting the items you want to sell, as through an advanced query, and highlighting them you can use Export to Plain Text. You can select which fields you want to be included, what delimiter you want to use between fields. The file this creates can be easily imported into a spreadsheet for any further processing you might want. In fact, one option you might want is to export the entire database (just the fields you want, of course), import the file into a spreadsheet and do your selecting and pricing there.