Hello Sofie- My daughter's name is Sophie!
It's hard to know exactly from this passage, but I believe this is what it means. Anytime 'ex-' is used (and this is a business or finance term, not a general English term), it means that whatever is being discussed is excluded in some way. For example, if a dividend-paying stock is sold 'ex-dividend', it is sold with the stipulation that the seller retains rights to the current or next dividend payout.
In this case, I believe TNT is a freight-forwarder or logistics company. TNT could even be a company manufacturing goods for sell by NVS. At any rate, TNT is handling the shipping for NVS:
It appears NVS offers options for customers to either pay shipping or get free shipping. If the customer chooses to pay freight ('ex NVS'), TNT bills the freight to the customer; if they choose the other option, freight is billed back to NVS.