AR Invoices to Multiple Addresses for the Same Customer

Hi

I need some guidance on generating invoices to multiple billing addresses for the same customer. The billing address will be driven by the company or business unit. I have investigated the possibility of using  Billing by Line of Business and this appears to meet our requirements. Is there any other option that meets this requirement.

Also I need some clarification on  Billing by Line of Business:

1. Can Billing By Line of Business be activated at any time or does it need to be done at go live;

2. Currently I cannot find the option to enter multiple addresses. Does this become available when the Billing by Line of Business is activated;