Good morning, @lyjoseph9.
As @john-pero stated, QuickBooks Online Essentials doesn't have the Inventory feature.
To compare all the features in the subscriptions, you can visit https://quickbooks.intuit.com/pricing/ to see all the plans side-by-side. If you like to upgrade your current subscription, here's how:
- Go to the Gear icon ⚙ at the top-right of the page, then Account and Settings.
- Navigate to the Billing & Subscription tab.
- In the QuickBooks Online section, select Upgrade.
- Choose the plan you want, and press Upgrade.
- Confirm your payment information and hit Save.

Thanks for reaching out to the Community! Have a nice day.