FOB and ASCP

Our supplier provides us FOB shipping term and we need around 6 days to get the material from the pier to our factory. How if we want to distinct the purchase order date and FOB date and actual stock-in date in both PO and ASCP setting?

I understand there is need day in PO but how we could use this in ASCP?

We want ASCP can calculate the precise purchase order date to our supplier with consideration of the FOB-to-factory day. Purchasing lead time seems cannot fully address my problem as we cannot see the FOB-to-factory days in the PO.

We are in EBS R12.2.6