Dear Anthony,
For that you need to follow the below step:
i. Add/create field for region (REGIO-Region) in to condition table in Tcode: v/03 for creation // v/04 for changes in existing (its recommenced to create a new table)
ii. Add the newly table created in your existing access sequence in tcoe: v/07 which is finally link to your condition type.
After doing the above to configuration, you will find the new key combination in VK11.
Hope this will help you out.
Thanks.
SS