subtask

noun

sub·​task ˈsəb-ˌtask 

variants or sub-task

plural subtasks or sub-tasks

: a task that is part of a more complex task

… I typed up a long list of every single task and even subtask I thought it would involve, from shopping for fixtures to picking up materials to installation.

—Matthew Vest

Word History

First Known Use

1912, in the meaning defined above