I'm happy to see you here in the Community, ilona. I can share some insights about merging two vendors into one account in QuickBooks Online (QBO).
If you encounter duplicate accounts, customers, or vendors in QuickBooks, you have the ability to merge them. This action combines all the data into the desired account while deactivating the duplicate. It's important to note that merging vendor profiles is a permanent change that cannot be undone.
To merge vendors in QuickBooks Online, follow these steps:
Navigate to the Expenses tab and click on Vendors.
Locate and open the vendor profile that you wish to retain, then click on Edit.
Take note of the Company and Display name for reference.
Return to the Vendors tab.
Find and open the vendor profile that you want to merge, then click on Edit.
Modify the display name to match the vendor you are merging it with.