It's done on the axefx, in the tonematch block you choose to export tm data to a user cab
From an Axe-Fx, save the 'Tone Match' as an IR, load it into a Cab block, then convert it to an AX8 preset/bundle..........done.I know Singtall is working on this to get a tone match preset working on the AX8... maybe he has some insight