New combination using member management versus EP Load

Hi,

I would like to understand the difference in creating new combination using member management with insert values option versus loading combinations with dummy sales data (zero sales) using item/location/sales history load through interface tables and followed by using EBS full download workflow.

if we have to create lot of combinations using member management, can that be replaced by the custom program to load the dummy sales history for those combination?

is it possible to create sales history with null values using the sales interface?

what would be the is_fictive status of the item combination that is created using the member management with insert values option?