Quickbooks price level list can help you adjust your price.
On your Quickbooks menu, click Lists and select Price Level List
Use the Price Level window to create price adjustment types.
At the bottom left, click Price Level:
Click New to add a certain Price Level for your selected customers.
Price Level Name: Use this field to describe your price level.
Price Level Type: Define how you want to adjust your price level - Fixed percentage or Per item sold.
This Price Level Will: Select the direction you want to adjust your price level and enter the percentage change.
Round Up To Nearest: Select if the price level should rounded up or not.
Click Ok to save the price level
To Customize your price list for a customer:
On the Quickbooks home page, click Customer
Double click Adwin Ko
Click Payment Settings on the left side of the window:
Click Ok to adjust the price level for Adwin Ko
This implies that anytime you create an invoice for this customer, the price level will increase by 2.0% automatically.