Requirements grouping across several projects

Hi,

We have a case where raw material requirements across several projects , have to be grouped together and MRP has to be run for genarating PRs.

1. What are the transactional steps involved?(A brief desc would do)

2. What are the config steps involved ? ( a brief desc would do)

3. Does someone has an example in the form of business process procedure ? Can it be shared with me (email ID : manohar84@rediffmail.com)

4. Which MRP needs to be run ? (PP-MRP / MM-MRP)

Thanks and regards,

Manohar