Assigning clients to sessions gives you visibility of where you are spending your time.
Create a client in focus booster HQ on the client tab. Assign an hourly rate if there is one associated, if there is not assign '0'.
Secondly, the clients you populate in HQ will be visible in the focus booster timer, to allow you to select the client you are working on for that session.
Clients can be assigned as clients (as you would expect!) or if you are studying or using focus booster for work you can substitute client names for your project titles.