I just migrated to QB online. I am having the same problem. On desktop version we used to reformat the packing slip to company needs. Now I have no way to do anything to packing slip. I modified the invoice to what our needs are but why packing slip does not pull the same formatting or allow us to modify the format. 

Every customer is looking for basic information but few additional info should be able to add to these forms to make it easy for all customers, We need help with Packing slip formatting