How can I adjust my invoice total to include shipping charges and miscellaneous adjustments?
Any miscellaneous amount you may want to associate to your quotes or invoices, can be added as Adjustments. The amount entered as adjustment is added to the invoice total. The Adjustments field is displayed right at the bottom of the quote/invoice creation page and can be configured by following these steps,
Go to Settings and select Preferences.
Scroll down to the section titled Select any additional charges you’d like to add and check the boxes Adjustments and/or on Shipping charges to include these on your quotes and invoices.