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Yes, you can, @tribble-tribble.
You'll want to go to the Expense menu and combine your vendor from there. I'd be glad to guide you how.
In your QuickBooks Online (QBO) account:
Here's an article you can read for more details: How to merge accounts, customers, and vendors.
Also, In case you want to apply a credit to your vendor, you can check this article that can guide you through the steps: Enter a credit from a vendor.
Let me know in the comment section if ever you need help. I'll be around to help. Stay safe!