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Let me guide you on this, hoiz32.
In QuickBooks Online, you can add products and services you offered in your business. You can also add inventory items. It lets you invoice your customers with the corresponding service they need.
If you need to add an inventory item, you'll want to turn on inventory tracking first.
Check these articles for more information:
Let me know if you need anything else.
As additional option, consider having a rental management app to integrate with your QBO.