offshoot

noun

1. Something which shoots off or separates from a main stem or branch of a plant.

   “the offshoots of a tree”

2. Something which develops from something else.

   “an offshoot of a criminal organization”

   “The reason is that the Berks & Hants Railway Company, under the powers of which the line was built, also included the Reading-Basingstoke section. The company was an offshoot of the G.W.R., which absorbed it before any section was opened.”