Initial load of multiple assignment of Vendors to BP data into MDG

Hello,

  We have a scenario where in our ECC system, we have multiple Suppliers created for the same supplier for some specific reasons. We are installing MDG and we need to do an upload of Suppliers into the MDG system. We plan to use BP concept to maintain the general data, address data etc and link all the ERP Vendors to this BP. Since MDG ECC does not support the multiple assignment of Suppliers to one BP, we cannot upload this setup using standard methods. Can you please propose a way to upload the data for BP, Vendors and multiple assignments into MDG. I guess creating BPs and Vendors would be straight forward using standard IDOC import, but how do i load the multiple assignments i.e the link table between BP and Vendors? Is there a standard way?

Thanks,

Kiran