ASSIGNING BUYER AT PR LINE LEVEL

We have a requirement to maintain buyer at PR line level.

Scenario:

The requesting department sends one line PR Item to procurement department. Based on requirements, the PROC dept. decides to split one PR line item into three lines and assign different buyers at each line level. The status of PR is in-process

While doing this the buyers are able to see their lines in AUTO-CREATE function to initiate the RFQ process. However, no email notification is received by buyers. But the buyer can't convert PR into PO (once quotation is finalized) until and unless all respective buyers completes RFQ/QUOTATION process and then PROC dept approves all PR lines.