An activity type is used while logging in your timesheets.
We create default activity types on .STUDIO that you can choose to use/edit or you can create a new one based on your requirements.
To create an activity, click on the profile icon & then on settings.
To the left of your screen under activities, click on the activity types tab.
To edit, click on the actions button and then on edit to make the necessary changes and on the billable toogle if needed 
Update Activity Type: You can update the Activity Type name and use the toggle to define whether the activity is billable. Enable the toggle to mark the activity as Billable.
To create a new activity, click on add activity type and 
Enter the name of the activity and choose whether you’d like to associate it with Projects, Opportunities, or Internal Activities. Use the toggle to define whether the activity is billable. Enable the toggle to mark the activity as Billable, and then click Save.
