I'd also like this fixed the soonest time possible, @ubiquitous.
Since the above solutions didn't work, contacting our support team is the best option at this point. They can perform a screen-sharing session to determine why you're unable to select a subcategory for your PayPal sales. They can also provide other fixes and even escalate this case if needed.
For the new Help menu interface:
- Click the (?) Help icon at the top.
- Select the Talk to a human option, and then type it again when prompted.
- Choose I still need a human, and then proceed with Contact us.

- Enter your question or concern, like "I'm unable to select a subcategory for my PayPal sales."
- Click Let’s talk.

- Select Get a call. You can also choose the Start messaging option to reach out to our support.
- Please follow the on-screen steps to continue.

For the old Help menu, please see this article for the steps: Contact QuickBooks Online support. It also includes the support hours when you can interact with them.
Also, I'll be adding this handy article for more PayPal insights: Connect to PayPal FAQ.
I'm just a comment away if you need assistance about managing your PayPal account. I'll get back to this thread to take care of your concerns.
I just thought I'd update this thread. This has been finally figured out. What is showing in the drop-down is from the Sales on the right side of screen. So you have to create it there and then categorize it accurately. Very odd way to do it - it really should work like the other bank accounts do so that it is more intuitive... that is the name of this company, right? ;)
I am still waiting for my first transaction to come across to confirm, but I think it has been solved.
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