I am trying to combine PDFs in a Folder with names (for example 123456_1, 123456_2, 234567_1, 234567_2, 345678_1, 345678_2). I want to combine 123456 prefix named PDFs as one set to merge and 234567 prefix named PDFs as one set, and so on. There are many sets in the Folder. I want a automate tool or app or excel macro to complete my job at a glance. Please help on this. Thank you.