"Upgrading servers" (using scripts): Mid-/Late-Game | Bitburner - A programming-based game
At the stage where you could afford x25 1.02 TB servers, it might not be the most efficient method to get all of them to target a single organisation.
The scripts shown in this video is an adaptation to the script used to upgrade servers, where the x25 servers are split into three groups, each targetting a different organisation.
Further customisation of the scripts could allow the purchased servers to be split into any number of groups, targetting the desired organisations.