Before cascading down a Key Result, you need to make sure that you have enabled this feature when assigning the new Manual Key Result to the Objective.
Right after doing that, here's the most efficient way to cascade down a Key Result:
- Navigate to a particular session from the Hub
- Navigate to the Alignment screen
- Choose a particular KR assigned to an Objective
- Click the ellipsis button > choose the cascade into one of the child OKRs option
- Fill in the form as shown on the picture below
- Click Save