customer based PIRs

Hi,

     Does anyone know how to have customer based PIRs loaded into MD61 ? I know I could have different active versions like 00, 01, 02 etc for customers. But is there anything better ? I am not asking APO SNP as thats out of scope.

Also how would I show the customer based forecast in MD04 like VSF/01, VSF/02, etc?

And once that is done how do I consumet customer specific PIRs?

Thanks