Good evening, info1985.
Welcome to the QuickBooks Community!
At this time, the option to update multiple sales prices at once isn't available in QuickBooks. I can see how being able to do this would be beneficial for you, So I recommend leaving feedback for our developers by heading to the "Gear" icon and clicking on the "Feedback" option. This feedback is viewed and considered when creating new features and updates for QuickBooks.
Feel free to reach back out if you have any further questions.