The first time you view a prior year's budget in a new year, Quicken asks you if you want to extend it to the new year. Just click OK and Quicken creates a new budget for you automatically, copying all of your current budget categories and budget values to the new budget.
If you want to get an early start
If you want to create next year's budget before the start of the new year, or if you want more control over how the budget is created:
It's possible to budget for an entire category group instead of entering a separate amount for each category within it. If you do this, any difference between the amount you enter for the category group and the total of the individual amounts for the categories in that group will be assigned to Everything Else line in your budget.
For more information, see Working with category groups.