I'll provide some information about the availability of the price rule feature in QuickBooks Online (QBO), sunpowe.
The Price rules feature's availability may depend on the region. It is currently unavailable in the QBO International versions. As a workaround, you can manually apply a discount to one or more items on your sales transactions.
For now, I'd recommend sending a feature request to our Product Development Team so they can review it and might consider implementing it on international versions in the future. Here's how:
Go to the Gear icon.
Select Feedback.
Enter your comments or product suggestions.
Once done, click on Next to submit them.
Moreover, you'll want to check these articles that will give you more info on how to manage your products and service items in QuickBooks Online: