Standard flow of Intersite Process

Hi,

Can someone confirm the standard functionality from the below two scenarios in IFS related to the Intersite process? 

1. When adding a new line to the already existing external customer order, then the system will create a new internal purchase order and customer order only for the new line.
2. When adding a new line to the already existing external customer order, the system will automatically include that new line to the already created internal Purchase order and Customer Order.

Thanks in Advance.