Hi there, David T1.
I'm here to help you consolidate your inventory items in QuickBooks Online (QBO). At this time, the system only allows you to merge accounts, customers, and vendors. This is because the inventory items are affecting the Inventory/Asset accounts and have Quantity On Hand that requires a correct tracking of your data.
You can refer to this article for additional information: How to merge accounts, customers, and vendors. It will guide you through the process of merging the information I've mentioned above.
Meanwhile, here's a reference when doing inventory adjustments:
Keep me posted if there's anything else you need about the process above. I'm always around to help you out. Stay safe!
