Once you enter this section you will see something like the following:

You may choose to export all items in every category by clicking on the "Check All" button then on the "Export checked" button. Or, you may, like pictured above, select one or a few categories to export. Once you have selected the categories to export, simply click on the "Export checked" button and the file will begin to download.

Once you have downloaded the file, you may open it in Excel or Notepad and make the appropriate modifications. Then you may import your file. For instructions on how to import, click here.