What you're trying to achieve can be done using the Price rules feature. However, this feature is not available in international versions of QuickBooks Online (QBO).
If you wish to use this feature, you might want to switch to a US version. Also, you can learn more about how Price Rules work through this article:Set price rules in QuickBooks Online.
You can look for various third-party applications that can be integrated with QBO integrates However, we aren't able to recommend a certain app, however, you may scan them online to help you manage your sales transactions.
Here's how:
Select Apps from the sidebar menu.
Go to the Find Apps tab.
Enter a keyword in the search bar or click the Browsecategory button to filter the results.