You can navigate to the Inventory Quantity Adjustment feature to update any mistakenly entered quantities in QuickBooks Online, Hilal.
- Click +New and select Inventory Qty Adjustment.
- Add any necessary details.
- In the PRODUCT/VARIANT column, choose the item for which you need to adjust the quantity.
- Enter the desired quantity in the NEW QTY column.
- Click Save and Close.

Next, to change the associated account, follow these steps:
- Go to Sales, then select Products & Services.
- Locate the transaction with the incorrect quantity.
- Click Edit, and in the Inventory Asset Account field, update to the account of your choice.
- Then, click Save.


Additionally, you can run the Inventory Valuation Detail report to identify any mistakenly entered transactions. This report provides a detailed overview of each item's quantity and value, helping you analyze your inventory more effectively.
Lastly, you can connect with our QuickBooks Live Expert Assisted team. They are available to help you navigate QuickBooks effectively and answer any questions.
These steps can help you correct any entered quantities in QBO. Have you been able to make the changes? If not, please let me know by clicking the Reply button. We're here to assist you with any further support you may need.