How to map the Items under iProcurement in 12.0.6 version..?

 Hi,

How can we map the items under iProcurement using the below example....?

Example: Created a Item Code: ABC001, under master Organization, now it has assigned to child Organizations (M1, M2), now I need to raise a Requisition to M2, i am able to find the item (ABC001)but, while creating the requisition I can able to find the source Organization as Master Organization and the sub inventories are related to only the Master Organization under requisition inforamtion window before i submit the requisition.

Here how can we raise the requisitions to M2 Organization just like in normal form how we are creating the requisitions? and also can any one explain me what