I guess this post is related to acis stored in the config. Unlike acis in the data, such acis are not replicated.
So you have to manually apply your changes on every server of your topology.
If server configuration is strictly equivalent on every server, you can output ldapsearch to a file then replay it with a ldapmodify. Howwver, if config files differ somehow, I
think it would be safer to extract those acis in Master A that must be added/modified and apply these changes only on the other servers.