Hi,
If you have an agreement with the vendor or supplier you may just return them to vendor.
or if the are waste, just add an adjustment to remove them and you may consider them as a waste by adding an expense categories called "Damaged Products" from setting menu and record them as an expense in the purchases - add expense menu so you can have a deep look how much they are costing you per moth.
this is only my idea.

thanks

so I have about 150 different items, how can I manage the damaged products? I did your recommendation but how expensive I can't put the product? it just the cost

Hello,

Quantity adjustment will adjust the stock only. There is no option to add the cost to damages, that why @Saif recommended add expense for the damage value.

Thank you