Few doubts & difficulties in MM

I have following doubts & difficulties in MM :

1) Can we have a release strategy for quantity contrats i.e. document type MK. If yes what is the table and field name to be put in release characteristic??

2) Can we have a release strategy for distributed contrats i.e. document type DC. If yes what is the table and field name to be put in release characteristic??

3) What is table and field name for PR release at Item level??

Is there any customization setting required to release PR at item level?

4) What is table and field name for PR release at Header level?? Is there any customization setting required to release PR at header level?

5) I am unable to transmit contrats and RFQ's through EDI. What is the procedure for the same