End-to-end scenarion with VAN

Hello!

Im totally new to B2B module, coming from Seeburger. Is there somewhere where I can read about a end to end scenario for a EDIFACT message to idoc?

I want to understand how B2B module handles messages. We have a VAN so all the EDIFACT messages will come from the same channel. Seeburger could read the GLN and split the messages to the correct ICO - how does this work in B2B?