Hi,
From within database programming you need to go to the top and click Tools > Operations > and then Import/Export. From there, select which system node you want to import FROM (meaning, you will get that node's extensions) then clear all of the check boxes except for the ones you want (i.e. Phones/Stations) and then perform the import. It's a good idea to do this for every node on the network to make sure all of the extensions are the same across all systems.