You can record waste products in Solmio, which will automatically reduce your inventory balance as follows:

Create a new discount in the HQ Portal
Reporting name and description: Waste
Type: Percentage
Discount amount: 100%

Create a new payment method for the sales point
Name the payment method Waste

Sell the waste products at the POS terminal
Choose Waste (Hävikki) as the payment method
Add a 100% discount (ensure that discounts are allowed for the product)

View reports on wasted products
You can find reports on waste products under the Product Group Reports page.
Select your desired filters and choose Waste (Hävikki) as the payment method.