Open the appropriate window and record bill or expense information. Make sure to link the customer to the expense by selecting the customer's name from the "Customer:Job" drop-down box. The QuickBooks window you open depends on the transaction you need to enter:
Billable Time: Select "Employees" from the QuickBooks main menu, then select "Enter Time." Select "Time/Enter Single Activity" if you have only one transaction to enter or "Weekly Time Sheet" if you have multiple transactions. Select the employee who performed the service from the drop-down list, select the customer and fill in time information.
Purchases and Miscellaneous Charges: If you made the purchase using vendor credit, click "Vendors" from the main menu, then "Enter Bills." If you used a credit card, click the "Banking" tab on the main menu and select "Enter Credit Card Charges." If you paid by check, click the "Banking" tab and select "Use Register." Fill in information as normal, making sure to link the correct customer to the transaction.
Mileage: Click "Company" on the main menu, then select "Enter Vehicle Mileage." Link mileage incurred to the vehicle used, enter odometer information and link the customer you will be charging.