If you need to adjust an on-hand amount for non serialized models,
First, locate the model in Inventory/Models.
Click the action button for adjustments
Enter the reason for the adjustment. Select a Location And enter the new Quantity.
Then Save. If you are adding more quantity, you will need to enter a Vendor for the internal PO that is created.
After that the quantity is added to your on-hand amount.
Note: If you have G/l turned on, there will be an adjustment made to the correct inventory account.