Please suggest options to manage customers Parent and Child Organizations where Child Organizations are based on regions or ares with different TradeAgreements than the Parent organization. How can i do that in D365F&O without using the relationships in GAB? And with GAB, how this is working?
They can be individual customer records with the invoice set to the parent. You dont really say what the basis of the child relationship is. You could also use chains. Ultimately they are different customer records because you want the entity differentiated.