The time effort object represents efforts carried out for a specific customer. They can be booked on business partners, sales orders, sales quotations, opportunities, production orders, service calls and time projects.
...
Efforts are created on the mobile app. In order to do this, navigate to the ‘Efforts’ tab or do it directly in an activity/service call (… or + -> ‘Create Effort’).
Creating an effort using the ‘Efforts’ tab
...
Creating an effort within an activity
...
Regardless of the way, the same data must be filled.
...