Hi there, @zul.

Thank you for utilizing the Project feature. I can share some insights about tracking inventory on hand in QuickBooks Online.

All inventory items are tracked through our Products and Services list regardless if it's for projects or not. Moreover, there are reports you can run for inventory tracking.

Here are the reports you can run and customize to track inventory. They help you better understand the performance of your products and services.

• Inventory Valuation Detail
• Inventory Valuation Summary
• Physical Inventory Worksheet
• Sales by Product/Service Summary
• Sales by Product/Service Detail
• Purchases by Product/Service Detail

If you wish to update your inventory quantity on hand, you can follow the steps below:

1. Click the Gear icon.
2. Choose Inventory Quantity Adjustment.
   
3. Enter the necessary information.
4. Click Save.
   

For in-depth information, you can check this link: How to set up Inventory tracking.

Keep me posted on how these steps work out for you. I'll be here to keep helping. Wishing you and your business continued success!