Users with admin-level permissions can assign expenses, or any other transactions, to a specific budget for better tracking.
Click the Accounts button if necessary, and then select the transaction from the Dashboard or Account page. (For more information about transactions, see Transaction Tables.)
Click the button to the right of the Budget label (highlighted in yellow, in the graphic), and select the desired budget from the list. The expense is now assigned to that budget. For more information about budgets, see Viewing and Editing Budgets
To assign an expense to multiple budgets, you must split the transaction. For more information, see How do I split a transaction between multiple budgets?