wp2print includes a function that allows you to increase or decrease all the prices in a price matrix by a certain percentage. This function is called a bulk price change.
To implement a bulk price change, click the button "Bulk price change" displayed at the bottom of the price matrix page as shown below:
After clicking the button, you will see a pop-up window that allows you to select whether the change will be a price increase or decrease as well as a field to set the percentage change. In the example below, this pop-up is configured to implement a price increase of 5%:
