eBay has officially updated the Mass Listing Editor. They just updated it. A few days ago it still did not allow the editing of Calculated services or Flat shipping services & cost.
You can now use the editor to edit listings in bulk. Editing now includes the ability to edit "Calculated shipping services" as well as editing Flat Rate shipping services and their cost.
You can only edit one full page of Auction listings at a time. Meaning you cannot select page 1, 2 and 3 at the same time.
To access the Mass Listing Editor, go to My eBay | Selling page.
Select the Auction listings you wish to edit.
Scroll to the bottom of the page.
The next page will display all the different fields that can be edited. You can uncheck anything you do not need or want to edit.
Scroll to the bottom of that page, select, "Edit in Bulk" and click continue.
The next page contains all the fields you selected for editing.
Complete your editing and select "Continue"
Don't forget to edit all the shippingn options in AW2000 before you list again or you will have a bunch of failed auction lots