You can add barcode fonts to your windows folder. Local Disk:C/windows/Fonts. In that folder add truetype fonts and you can now use a barcode as a font in QuickBooks and put it on Purchase orders and work orders. But QuickBooks doesn't have a encoder that makes the barcode scannable so you have to use a 3rd party software at the moment or at least I haven't figured out a better way. What that means is you will have a barcode on the work order but the barcode isn't scannable. For example code 39 font for a barcode to scan lets say numbers 1234. They need to be in the barcode font as *1234*. Code 128 is even more tricky that you cant just put an asterisk in front and back of everything you want to scan.

The work around,

Use this website as an encoder - https://www.bcgen.com/fontencoder/

And type what needs to be scanned into the "data to encode tab" and then copy the encoded text and paste that into where ever your template calls for a barcode.

I'm still working on figuring out a better way than this since its not automated and is more data entry but its all I got for now.