Category groups organize your categories. For example, all of the categories related to your spending are grouped together in a category group called Personal Expenses. And all of the categories related to your income are grouped together in the Personal Income category group.
Category groups are can be customized. Whether you choose to create your own or use the default category groups, they can greatly simplify the presentation of your Quicken budgets and reports, and make finding and choosing categories in the register much easier.
Delete a category group
You can include category groups only in summary, comparison, or budget reports.
Suppose you want to budget $100 a month for the categories Movies and Books, but you don't care how that $100 is split between the two. Instead of budgeting a specific amount for each category, you can assign the categories Movies and Books to the category group Discretionary, and budget $100 a month for Discretionary expenses.
If you're considering using category groups, you may want to use tags instead. Tags provide the functionality of category groups but with more flexibility. Category groups are included for compatibility with earlier versions of Quicken.