freight cost calculation in inbound trasportation

I have read the very interesting  documento: http://scn.sap.com/docs/DOC-2147 and I have a couple of questions:

1)How should I customize conditions in order to have freight cost already calculated by SAP . The calculation is based on: the supplier city and the total weight of the inbound delivey. Where should I find the step by step customization?

2) Shoud I use MIGO instead of VL32n and obtain the same result?

Thanks in advance,

Best regards