You can create as many Outcomes and Trackers as you need to
Alternatively, rather than creating new goals and sub goals, you can browse existing goals from
There are differences between Outcomes and Trackers.
Steps
Go to the Create Outcome page
Click Create in the top menu
Click Show More Options at the bottom of the list
This causes the list to expand to the side
Select Goals & Trackers from the expanded list
This takes you to the Create Goals & Trackers page