Hi Gimmy;
If you are using Appeon Mobile, that feature is "built in". You can write PB code to have your smart phone or tablet interface to the camera & read bar and QR codes. Appeon Mobile can even take a code in string format and create the digital form from that. Its a really "kool" feature.
For PB Classic, you would have to interface to a scanner or a laptop camera and interact that way. For this, you would need a 3rd party product in the form of a DLL or OCX control.
FYI: Barcode Reader Toolkit for Windows - Download Now!
Regards ... Chris