I would take a look at some of our sample projects. A lot of those offer different ways to count/accumulate quantites for a given barcode scan. Also, feel free to join our Open Office Hours every Tues @ 2:00 EST and Thurs 10:00 EST. This is a perfect question for that environment.
I did attend the Open Office but there seemed to be some tech difficulty as far as clearly asking the question. All I want is to scan barcodes with a qty number and have it total it at the end. I watched an old TP video with a similar scenario and it is not working. I have attached my project here. Thank you