this is very useful information..I have one doubt..Q1 :- what if, we have 2 Purchasing Info record mark for Auto sourcing, in such case, which Source will get priority from MRPQ2 :- if there is a Manual PR, can we get similar sourcing feature via ME5...

Correct path is :SPRO --> MM --> Purchasing --> Purchase Requisition --> Define Mapping of Material Group to Purchasing group