Your helpdesk may enable you to bill users amounts of money based on the support you provide, or record how long it takes to resolve a ticket, or both.
Depending on which of these features is enabled, you will see a Billing, Time Log or Billing & Time Log tab when you have a ticket open in the content pane.
You can view previous charges for an organization from its profile in CRM, as well as from the Billing section of the reports interface if you have access to it.
To use billing:
The billing currency is set by your admins.
To use the time log:
Your helpdesk may have been configured so that the timer starts automatically when you open a ticket. You still need to click Add Charge to record the elapsed time.
If you have the correct permission, you may be able to directly enter an amount of time, instead of running the timer.
If you have the correct permission, you may be able to edit previous logs and charges.
If you have editing permission: