There are multiple ways to get the service/manifest pdfs.
There are multiple ways to get a customer's service/manifest pdfs, but there is no way to combine them together into one big pdf.
A customer's past manifests can be pulled up in their compliance portal when they log in, under My Docs. Or they can go to My Docs > Service Reports, put in a date range and get them all pulled up there. Or you as an affiliate can do it under Manage Manifest > Manifest Reports > Pickups & On Truck. Just narrow your search from All Customers to whatever you need, and put in the appropriate date range.