When splitting a transaction the second drop down under category does not function (no search, or drop down) any fixes?

I'm here to help you fix the unusual behavior of Your QuickBooks Online account, @braden-barrancoc.

To narrow down the problem, I advise opening your account on a private browser. Unexpected behavior is caused by the cache that your browser has stored. A private browser guards against any virus infections that can result in erratic QuickBooks behavior.

Follow these keyboard shortcuts:

• Google Chrome: Ctrl + Shift + N

• Safari 11 or newer: ⌘ + Shift + N

• Mozilla Firefox: Ctrl + Shift + P

• Microsoft Edge: Ctrl + Shift + P

If everything goes well, switch back to your default browser and clear its cache to start over. Moreover, you can use a different supported and up-to-date browser to filter the results.

For future reference, you can check this article to guide you in editing transactions in account registers: Find, review, and edit transactions in account registers in QuickBooks Online.

Let me know how else I can help you splitting a transaction in QuickBooks Online. I've always got your back. Have a great day.