Update: Be sure to read the second comment for this post, where it explains that you don't have to have the original packages that you uploaded; instead, you can download the original metadata and then edit it.
Yesterday, I railed against Apple for making it so time consuming to add new territories with iTunes Connect. That process is still excruciatingly slow, but thankfully, David Fox of Electric Eggplant found a faster way: with iTunes Producer. Here's how it works.
Open iTunes Producer. Then choose Open Package… in the opening dialog box.
You'll get a dialog box that lists the “packages’ of the books you've uploaded so far. A book package is the information that iTunes Producer compiles about your book when you uploaded it the first time, including the location of the EPUB files, metadata like the author, publisher, and ISBN, and the market information. The package names reflect the ISBNs of your books.
The process I'm going to describe will only work if you have NOT moved or changed any of the files associated with your book. You are going to upload the book again, so if you've moved the files around, those changes will be incorporated. Proceed with your eyes open!
Choose the book to which you wish to add new territories and click Open. (By default the saved package files can be found in the Playlists folder inside the iTunes Producer folder inside the Music folder.)
iTunes Producer will show you the information about your book just as it appeared the last time you uploaded it to the iBooksore.
Click the Territory Rights button at the bottom right. You'll see the original territories that you created when you last uploaded this book. Note that you won't see any territories you may have added through iTunes Connect.
Since I had already started adding territories with iTunes Connect, the fact that only the original territories appeared here worried me. But I have found that you can add only the new territories desired in iTunes Producer and it does not override the list of territories in iTunes Connect, it only adds to it. That is, any countries that you added with iTunes Connect but that are not listed here should remain.
Click the Add Territory button just below the list of territories. Only the countries that you have not yet added in Producer will appear. Territories that you added with Connect will also appear. Choose the desired territories that you haven't yet added in either place.
The Territory field with its initial empty contents always flusters me a little, as if I'm supposed to remember which territories there are to type one. But once the cursor is there, simply press the down arrow to get the next one in the list, and then press Return. Remember that you do not have to readd the countries that you already added with Connect.
Note also that if you do add a country that you already added with Connect, the new information will override the old (say, if you changed the price or whatever).
Then add in the rest of the information for the book. You'll find that there is no lag between selections. This is so much nicer!
When you're finished adding territories, click the Next button and make any other desired changes.
Once you've made all the desired changes, click the Deliver button. (I have to say I always find it disconcerting that iTunes Producer automatically gives me an error on the last page because there are unsaved changes, and then automatically goes about saving those changes and eliminating the error.)
When you get the nice big green arrow, go on over to iTunes Connect to confirm that everything's the way you want it.
It may take a few minutes for iTunes Connect to update the information. Note, in this example, that I have uploaded all of the remaining 25 territories to this record but the first 7 that I had added in iTunes Connect are still the only ones that appear.
After a minute or two, I saw that iTunes Connect had reordered my books (ostensibly to put the ones with the most recent changes at the front of the list), and now lists the 32 markets in which my book may be purchased.
Many thanks to David Fox for alerting me to this much faster and better system!