PO Penetration for Outbound Logistics Costs

Hi Gurus,

I am currently exploring a way to convert our FB60 invoice postings to MIRO postings. My concerns are below:

1. Can I use GR Non Valuated PO for Outbound logistics costs?

2. Can I use many PO line items for each PO because each transaction have different cost center and GL account combinations?

3. If a PO is GR Non Valuated, is it OK not to post MIGO in it and just continue to post MIRO?

I really need your help on this.

Thank you very much and God bless you all.