For setting the quantity of the products we need to scan the barcode for 100 time, in your case. If you don't want to do that then you can directly validate the picking by a single scan.

By default Odoo is  having different barcode for different operations. The operations like Validate, Discard, Cancel, Scrap, Put in pack etc. You can take the printout of these operations from the settings.

Inventory -> Configuration -> Settings

Under Operations tab you will see a button named Print Barcode commands.

If you click on this link you will able to download the PDF file with the operations and its barcode.

To have all these you need to enable the Barcode Scanner in the settings.
Regards