MRP PR - As per Quota

Dear All :

We are runing MRP , want to generate PR as per source list , quota arr.

I defined source list , quota arrangement , source list activated in mm master.

Auto PO indicator in vendor master activated.

PR getting generated.

my question is :

1) whether i have to run me56 to assign source of supply to PR every time?

2) Can MRP itself generate PR which having assigned source of supply ?

2) system creating single PR , if in quota arrangement if i mentioned 2 vendors 70% and 30% share , how to assign single PR in two vendors through me56 OR

3) how to generate source assigned two PR through MRP with help of Quota defined.

Vijay Vadgaonkar.