How do I do a multiple package shipment, to the same location, using USPS?

Question

I cant seem to find online anywhere how to create a mulitple shipment package, to the same location (different box dimensions and weight)? I use USPS online EVERY day, and cant seem to find the info anywhere?

Using Fed Ex, it asks you "how many boxes in the shipment". With the USPS, I have no clue where to add this info, or do I have to create seperate shipments?

Answer 1

information at link below.