what can I do to check if I am doing the right thing to invoice and add inventory, when my inventory quantity is not correct

We can use the Inventory Valuation Detail report to confirm the inventory quantity and ensure you add the correct item numbers for your products and services, hello253.

This report provides insights into the correct quantities and transaction details for each inventory item in your QuickBooks account. To generate this, here's how:

1. Go to Report, then select Standard reports.
2. Search for the Inventory Valuation Detail report.
3. On the report page, add the correct Report period.
4. Once done, check and take note of the total for each quantity in the Qty column.
5. Then, check all the associated transactions for each item to verify if the stocks have been added over time.

Once you've confirmed the correct quantity for each item, we can adjust your inventory to match it.

If you have other concerns or questions, feel free to comment them below.