how can i load my record for advanced pdf ? like do i have set EVERY value manually through JSON? or it can just pick id i provide the internal id..and it sets just the way when i click print on sales order it takes everything from the record, is there a way to directly take it? i am creating a sublist including items that are ready to be picked .. and on click i want a PDF to generated.. i am sending t the data through JSON and setting every line.. i want like doc no, date, picked status, from the record.. i can set it through JSON by sending stuff.. i suppose there is a efficient way to achieve this? or any other way?

You can access the field values and item sublist values directly in the Adv Print without resorting to replicating it all in fields using JSON.

okay, dont i have to provide anything to adv print?

The print template is associated with the record. It sounds like you have a fair bit of studying to do around how forms / print templates work.

This is one way to achieve as per your concern

i want to print the picking ticket in relation to the sales order is that not possible?