Hi @Greorge,

I can give insights about adding inventory items in QuickBooks Online. The Inventory feature is only available for Plus and Advanced versions of QuickBooks Online. 

You'll want to upgrade your QuickBooks plan to start tracking your inventory. Here's how: 

1. Click the Settings menu, then select Account and Settings.
2. Go to the  Billing & Subscription tab, then select Upgrade in the QuickBooks Online section. 
3. Choose the plan you want, then select Upgrade.
4. Confirm your payment information. 
5. Select Save.

Once done, follow the steps to set up and adding the stock part to your inventory through these articles: 

• Add inventory products in QuickBooks Online
• Set up and track your inventory in QuickBooks Online

Thanks for dropping by in the Community, @Greorge. I'm always around here to help should you have more concerns about inventory.