OK I got WOW1 account setup and want to do accounts WOW2, WOW3, WOW4 and WOW5 with the following setup

A > B > C
A > D > E

I want all accounts under the same battlenet ID.

So what do I do to ensure that it is account B sending the invite to account C and not A sending the invite? Since they are all under the same battlenet, I am not sure how to create that hierarchy