QuickBooks Online is such an awesome time-saving tool to use for your small business. Having the option to track inventory in QBO will add additional capabilities to the program for you to take advantage of. I'd be happy to explain how to get the inventory tracking feature if you're not seeing it in your account.
Inventory tracking is available in QuickBooks Online Plus. The feature allows you to:
If you're currently using QuickBooks EasyStart or Essentials, you can upgrade your account by following the steps here: Upgrade your QuickBooks Online subscription.
For more information about inventory tracking, check out this helpful Community article: Set up and track your inventory in QuickBooks Online.
I hope this helps get you back on track.