You can enter details of your customers that can be used to define projects and project activities. To add a customer, select Time> Project Info>Customers. The customer Screen will appear.
Step 1 - Click ‘Add’ button in the Screen. The Add Customer Screen will appear.
Step 2 – Add the name and description as well as the Cost center.
Step 3 – Click Save button.
Read Article - Add Cost Center
Read Article - How to Setup and Configure Timesheets