ISN can allow you to price based on control drop down values.
Navigate to Settings -- Office Settings -- Inspection and Fee Settings -- Customize Order Form
Find the order form section which has the controls you want to attach fees for and click Edit Controls
Find the control you are targeting and look at the "Fees" column and click Edit
Additionally, there is a helpful information bubble that changes based on the type of control you are working in. It provides example usage. This is to help provide you some direction since this screen is one of the more advanced and deeper ones in the ISN.