Setting Up BP data for BOB Scenario

All,

We have a requirement to implement BOB Scenario using CRM as backend in one of the clients here. I was succesfull in setting up the scenario and even placing an order. I had couple of questions and need clarifictions on the same. I would really appreciate your help on this.

1) I have set up a contact person and assigned him to a BP with SoldTo role.

2) I have created couple of other BP's as person and assigned them the "is end cutomer of" relationsip to the sold to.

3) Only the customers associated with the above relationship are showing up in the customer search screen in the application.

4) Any BP's associated with relationship "has a ship to" for the sold to is not showing up in the customer search screen.

Question: So do we have to set up all ship to's as "End Customer of" the sold to?

If yes then when the order gets created what will be filled in the ship to details?

Also since master data is maintained in ECC, How will we map the shipto's to the "Is end customer of " relationship?

Please help me understand the above.

Thanks in advance.