When creating a new category you can optionally define a category code (a visible short-code, to match your billing or project management system). The charge hourly rate is used to automatically calculate charte amounts based on the duration of time entries.

Project estimates and project budgets (Pro) can be compared with actuals and projects at risk can be identified in reports. Tags are free form text values that can be used to group time entries as a form of cross-categorization, such as grouping by priority, status or work type.

External references (Pro) can be used with the database script tool or direct database access to link categories to entities in external systems such as accounting and project management systems.