How do I set up Inbound Shipping?
In Settings, under Amazon Specific you can set up your inbound shipping rate for FBA shipments into Amazon
In analysis we look at the product weight and factor the appropriate amount in for that product to be shipped in; so you would need to calculate it based on what you're currently being charged (e.g. a 50 kg box cost €15 for you, so 15/50 = 0.30 per kg).