Hello @OFM,
Your browsing history can be the reason why you're unable to select a class when categorizing a split transaction. Let's perform some browser troubleshooting steps so you can categorize them correctly.
Let's start by accessing your account in a new incognito or private window of your browser to check if this issue is related to your current browser or not. To do so:
- Google Chrome: Ctrl + Shift + N
- Mozilla Firefox: Ctrl + Shift + P
- Safari: Command + Option + P
From here, you can clear your regular browser's cache if you're able to select a class for your split transaction. If not, let's switch and use a new browser application and categorize your transaction.
Lastly, here's a few articles you can read to help manage your bank account and transactions: Banking and Bank Feeds for QuickBooks Online.
If there's anything else that I can help you with, please let me know in the comment section down below. I'll be always around ready to help.