In the old days there was a boundary realignment tool in MLS. I'm not seeing anything in the help center or the Wiki on how it's done now.
It's possible that as part of the realignment proposal that all the members have already been identified and someone just has to "push the button" to send them in bulk. DO NOT try to manually move them out one by one. You'll likely lose their contact information in the process and end up creating a mess.
If no one here comes up with an answer soon, I'd call GSD for instructions.
Have you searched the
Help Center? Try doing a Google search and adding "site:churchofjesuschrist.org/help" to the search criteria.
So we can better help you, please edit your
Profile to include your general location.