Hello there, @sibylp.

The Price Rules is a beta feature in QuickBooks Online (QBO) Plus which is currently available for US regions. There's is a possibility that you're using a QBO Simple Start or signed up for a different region.

However, if you're using a QBO Plus and signed up for the US region. We can try logging in to your account into a private browser. This way, we can check if it's a browser-related issue.

You can use these shortcut keys depending on the browser you're using:

• Google Chrome: press Ctrl + Shift + N 

• Mozilla Firefox: press Ctrl + Shift + P

• Safari: press Command + Shift + N

If it works, go back to your regular browser and clear its cache. These caches of data are essentially junk files and can be safely deleted to free up storage space. Otherwise, switch or use a different browser.

Once done, you may refer to this article to create a price rule: Set pricing rules in QuickBooks Online.

Additionally, I'd be adding a helpful article that may help you when you have QuickBooks Online concerns, such as managing your account, setting up and processing payments, etc. This will help to keep your business running smoothly: QBO Help articles.

Fill me in if you have other QuickBooks concerns. I'm always around to help. Take care always.