Inventory tab, select the product you want to write-off and click
Quantity (Mandatory): enter quantity to remove (in single units).
Date: date of adjustment.
Reason: enter free-text reason for removing products. It is optional but it’s a good practice to enter it. Displayed as description in Product History screen as well as in report Write-Offs / Adjustments.
After saving the data, product In-Warehouse stock is decreased by the write-off quantity and Total In-Stock quantity is recaclulated.
Write-off is displayed in the list of product movements, on Inventory -> Product History screen: