subdevelopment

/ˌsʌbdɪˈvɛləpmənt/
noun
  1. A secondary or lesser stage of development; development that is part of a larger development process.
    • Each subdevelopment in the project had its own budget and timeline.
    • The subdevelopment of the software module was completed ahead of schedule.
    • Urban planners discussed the subdevelopment of the northern district as a separate phase.