Simple thinning as far as knocking the shoulder bevels off, no. In fact many new sharpeners do this unintentionally.
Thinning is the same as sharpening, just at a lower angle so the edge is OFF the stone but the knife isn't flat either. Just get your sharpening technique down pat and thinning should be easy to figure out. Sharpen first, thin later.
It will be an even shallower angle and feel weird at first, but once you learn to hold a consistent angle thinning without grinding the snot outta the flat of your knife should be pretty easy to do.