During my GB training, I teach them the difference by describing what’s and how’s. High level tasks/steps are the what’s (i.e., what to do). Lower level or detailed tasks are “how to do the what’s”.
There really isn’t a hard and fast rule. The key is that the team/person should understand what is being done. Basic thing I have learned, when describing process in high-level detail, is that if it takes more than 5 minutes to describe it, you are too complicated.
I may not have been much help, but it really depends on your process as to the level of detail you desire.
.
