You have the ability to add "Additional Charges" to your system.
To do so you will go to Manage--->Admin--->Settings--->Estimates--->Additional Charges.
Once in your Additional Charges you will be able to add a "New Additional Charge" by selecting the Blue button in the top right hand side of your screen.
Action - Update (GREEN): updates individual charge after a change is made
Action - Delete (RED): deletes a charge
Percentage charge (ORANGE): charges a percent of the total if number is entered with a % symbol
Dollar charge (YELLOW): charges a flat dollar amount if entered as a whole number with a decimal
Default (Purple): when checked this charge will appear as a default on the estimate