Administration

As an administrator user, you can enable/disable features as per your company requirements. Enabling/Disabling a feature can cause certain options to be hidden or shown in the application.
For example, if your company does not do "Billing", and hence, you pick - None - as your Billing model, then the associated columns like Bill Amount, Bill Rates, Billable Flag are not available in reports or task/project details page. Similarly, while creating/editing a project, the Billing Model field is not shown.