How do I assign specific terms and conditions to a segment?

It is not possible to assign T&cs to a segment. However, it is possible to assign them to a Client Group. When you need to assign specific T&Cs to certain clients, you must go to "My clients" and then "Create a new group".

Add the name of the group and save. A new "Client Group Management" window will open. You can then assign the general sales conditions that correspond to this type of group.