Two options...
1. Use "Axe-Manage Cabs" in Axe-Edit III (Axe-Manage Cabs will convert the .wav to .syx for you and let you audition the cabs as you go).
or
2. Use Cab-Lab 3 Lite (download links available at the bottom of this page
https://www.fractalaudio.com/cab-lab-3/) to first convert your .wav to .syx in batch (using "Wav2Syx... " under the Tools menu), and then use Fractal-Bot to transfer the cabs to your Axe-Fx III