Yes, you can absolutely add and rename Disciplines after the initial setup is complete. In Specify, the “Discipline” is a level of the hierarchy that sits under a “Division” (what you’ve called your Departments). While the system configuration process asks you to pick from a list of standard templates (like Ichthyology, Entomology, or Geology), these are essentially just starting points for your data schema. You can adjust this using the System Configuration Tool.