Thanks for your prompt response, @MickeyK.
The Vendor Item Tab's purpose is to allow you to use multiple vendors, depending on pricing and availability. It is why the cost isn't present in the Vendor Item Tab when you edit the item in the Inventory Center or List of Items.
Once set up for Vendor Item List is done, you'll visit the main item Lists to designate the primary and alternate vendor.
The purpose of this new feature is to compare the vendor prices for the related items when you create Purchase Orders. That's why the cost isn't showing in the Purchase Order when using the compare vendor's function.
For more details, you can check this video article to learn more about this feature: How to use alternate vendors in QuickBooks Enterprise.
I've added this page as your reference in handling your inventory, products, and services in QuickBooks: Manage inventory.
You know you can always share your progress here if you need more assistance. I'll be around to help. Take care!
